How to plot pitch motion for free decay test?

mo_na · May 2, 2016, 06:15

Hi all,

I am simulating a floating body in pitch motion and I would like to do a free decay test to compare with experimental results.
I am using a moving mesh and the log file contains information like this:

Code:

6-DoF rigid body motion
    Centre of rotation: (0 0 0)
    Centre of mass: (0.58783434026 0 -0.181372871211)
    Orientation: (0.995632340385 0 0.0933608203665 0 1 0 -0.0933608203665 0 0.995632340385)
    Linear velocity: (0 0 0)
    Angular velocity: (0 0.0586546346079 0)

Is there a way to write the orientation of the body in a separate file to plot the pitch motion after? Or is there maybe another way?

Cheers,
Mona

hchen · May 23, 2016, 04:27

Hi Mona:

Did you manage to do it?

Best regards
Hao

Quote:

Originally Posted by mo_na

Hi all,

I am simulating a floating body in pitch motion and I would like to do a free decay test to compare with experimental results.
I am using a moving mesh and the log file contains information like this:

Code:

6-DoF rigid body motion
    Centre of rotation: (0 0 0)
    Centre of mass: (0.58783434026 0 -0.181372871211)
    Orientation: (0.995632340385 0 0.0933608203665 0 1 0 -0.0933608203665 0 0.995632340385)
    Linear velocity: (0 0 0)
    Angular velocity: (0 0.0586546346079 0)

Is there a way to write the orientation of the body in a separate file to plot the pitch motion after? Or is there maybe another way?

Cheers,
Mona

mo_na · May 24, 2016, 04:40

Hi Hao,

no I havn't managed yet. Do you have an idea how to do it or do you want me to tell you as soon as I figured it out?

Cheers,
Mona

mo_na · May 27, 2016, 06:45

Hi all,

I have some ideas now how to do it but I am not quite there yet.
In this thread simon-2 describes a way to obtain sixDoFRigidBodyMotionState files for each timestep:
http://www.cfd-online.com/Forums/ope...tml#post601930
He said it was just a matter of batch processing to write all the information into one file so you obtain a file like this:

Code:

#time centreOfMass orientation velocity acceleration angularMomentum Torque 
80.0199 ( 3.3 0 0.1386375 ) ( 0.99807619 0 0.061999301 0 1 0 -0.061999301 0 0.99807619 ) ( 0 0 0.0045163445 ) ( 1.3211615 -2.6233042 0.84606626 ) ( 0 -0.2529557 0 ) ( 1109.8274 99.511973 -24.488035 ) 
80.0298 ( ... ... ... ) (.. ... ... .. .. .. .. .. ..) (.. .. ..) (.. .. ..) (... .. ..) 
80.0398 ( ... ... ... ) (.. ... ... .. .. .. .. .. ..) (.. .. ..) (.. .. ..) (... .. ..) 
80.0497 ( ... ... ... ) (.. ... ... .. .. .. .. .. ..) (.. .. ..) (.. .. ..) (... .. ..)

But I havn't figured out how to do it.
I also found this python-script: https://github.com/kodejak/openfoam-data-extractor
This script extracts searched datas from the OpenFOAM project generated files e.g. gravity, centreOfMass etc. The datas will be stored as a CSV file located at the directory of the script, named like the command line search pattern.
But then I still need to do this for every single sixDoFRigidBodyMotionState file and thats a lot.
Any ideas?

Cheers,
Mona

mo_na · June 1, 2016, 10:51

Hey,

for everyone struggling with the same issue: I found a shell script that writes out data from the logfile and modified it a little bit to match my needs:

Code:

#!/bin/bash

PFAD=log
EXCL=10

# cat   list a files content on a screen / in a pipeline (using "|")
# grep  returns all lines matching a certain string
# cut   cuts out e.g. fields "-f" (here 3rd until END [-]) specified through delminiter "-d' '" (here blanks)
# sed   remove complete lines containing a certain string (here "ClockTime")
# sed-i includes Header
# head  deletes last 10 lines (for scaling reasons, as last lines are often already diverged)
# tr    remove certain strings (here "(" and ")")
#paste  merge two files line by line

################ CLEAR OLD DATA ################
rm -r data

##################### TIME #####################
cat $PFAD | grep 'Time = ' | cut -d' ' -f3- | sed '/ClockTime/d' > Time.dat

############### ORIENTATION  ###############
cat $PFAD | grep 'Orientation' | cut -d' ' -f3- | tr -d '(' | tr -d ')'| tr -d 'Orientation:' | sed -e 's/[\\ \\]/      /g' > orientationTemp.dat

############### LINEAR VELOCITY ################
cat $PFAD | grep 'Linear velocity' | cut -d' ' -f3- | tr -d '(' | tr -d ')' | sed -e 's/[\\ \\]/        /g' > linearVelocityTemp.dat

############### ANGULAR VELOCITY ###############
cat $PFAD | grep 'Angular velocity' | cut -d' ' -f3- | tr -d '(' | tr -d ')' | sed -e 's/[\\ \\]/       /g' > angularVelocityTemp.dat

########## MERGE FILES & ADD HEADER ############
mkdir data
paste Time.dat orientationTemp.dat > data/orientationTemp.dat
sed -i '1i#Time, cos, 0, sin, 0, 1, 0, -sin, 0, cos' data/orientationTemp.dat
head -n -$EXCL data/orientationTemp.dat > data/orientation.dat
paste Time.dat linearVelocityTemp.dat > data/linearVelocityTemp.dat
sed -i '1i#Time, u, v, w' data/linearVelocityTemp.dat
head -n -$EXCL data/linearVelocityTemp.dat > data/linearVelocity.dat
paste Time.dat angularVelocityTemp.dat > data/angularVelocityTemp.dat
sed -i '1i#Time, p, q, r' data/angularVelocityTemp.dat
head -n -$EXCL data/angularVelocityTemp.dat > data/angularVelocity.dat
rm Time.dat
rm orientationTemp.dat
rm data/orientationTemp.dat
rm linearVelocityTemp.dat
rm data/linearVelocityTemp.dat
rm angularVelocityTemp.dat
rm data/angularVelocityTemp.dat
rm plot/*.png

So copy this code into a file called data.sh and execute after running simulation with

Code:

bash data.sh

This will write you some .dat files, that you can open/plot with matlab/ocatve/excel/whatever

I hoped this will help someone!

Cheers,
Mona

havref · November 23, 2016, 05:04

Exactly what I have been searching for. Thanks!

Adri_12 · October 16, 2018, 12:09

Hi Mona,

I am using the new rigidBodyDynamics library instead of the classical sixDofRigidBodyMotion ?

The problem is that I do not understand how to explore the log file info since the CoG is not logged out anymore. What we have instead is a "center of rotation" but it is not the kind of point I am looking for, a CoG or a manually point to follow would be better. Here you have an example :

Code:

Courant Number mean: 0.000365065 max: 0.934088
Interface Courant Number mean: 1.39805e-05 max: 0.301043
deltaT = 0.00981865
Time = 2.43733

PIMPLE: iteration 1
forces forces:
    Not including porosity effects
Rigid-body motion of the BOAT
    Centre of rotation: (0.148519 -3.25435e-06 -0.00757061)
    Orientation: (0.999997 2.91458e-07 0.0022597 -2.91323e-07 1 -6.00382e-08 -0.0022597 5.93798e-08 0.999997)
    Linear velocity: (0.0538253 3.10699e-06 0.0702008)

Moreover, a "q" 6 dimension vector is automatically copied in the folder /uniform/rigidBodyState that seems to match with the log point info.

If you have some info about the way to extract CoG info, please share it

Adri

Robin86 · December 22, 2018, 08:38

Quote:

Originally Posted by mo_na

Hey,

for everyone struggling with the same issue: I found a shell script that writes out data from the logfile and modified it a little bit to match my needs:

Code:

#!/bin/bash

PFAD=log
EXCL=10

# cat   list a files content on a screen / in a pipeline (using "|")
# grep  returns all lines matching a certain string
# cut   cuts out e.g. fields "-f" (here 3rd until END [-]) specified through delminiter "-d' '" (here blanks)
# sed   remove complete lines containing a certain string (here "ClockTime")
# sed-i includes Header
# head  deletes last 10 lines (for scaling reasons, as last lines are often already diverged)
# tr    remove certain strings (here "(" and ")")
#paste  merge two files line by line

################ CLEAR OLD DATA ################
rm -r data

##################### TIME #####################
cat $PFAD | grep 'Time = ' | cut -d' ' -f3- | sed '/ClockTime/d' > Time.dat

############### ORIENTATION  ###############
cat $PFAD | grep 'Orientation' | cut -d' ' -f3- | tr -d '(' | tr -d ')'| tr -d 'Orientation:' | sed -e 's/[\\ \\]/      /g' > orientationTemp.dat

############### LINEAR VELOCITY ################
cat $PFAD | grep 'Linear velocity' | cut -d' ' -f3- | tr -d '(' | tr -d ')' | sed -e 's/[\\ \\]/        /g' > linearVelocityTemp.dat

############### ANGULAR VELOCITY ###############
cat $PFAD | grep 'Angular velocity' | cut -d' ' -f3- | tr -d '(' | tr -d ')' | sed -e 's/[\\ \\]/       /g' > angularVelocityTemp.dat

########## MERGE FILES & ADD HEADER ############
mkdir data
paste Time.dat orientationTemp.dat > data/orientationTemp.dat
sed -i '1i#Time, cos, 0, sin, 0, 1, 0, -sin, 0, cos' data/orientationTemp.dat
head -n -$EXCL data/orientationTemp.dat > data/orientation.dat
paste Time.dat linearVelocityTemp.dat > data/linearVelocityTemp.dat
sed -i '1i#Time, u, v, w' data/linearVelocityTemp.dat
head -n -$EXCL data/linearVelocityTemp.dat > data/linearVelocity.dat
paste Time.dat angularVelocityTemp.dat > data/angularVelocityTemp.dat
sed -i '1i#Time, p, q, r' data/angularVelocityTemp.dat
head -n -$EXCL data/angularVelocityTemp.dat > data/angularVelocity.dat
rm Time.dat
rm orientationTemp.dat
rm data/orientationTemp.dat
rm linearVelocityTemp.dat
rm data/linearVelocityTemp.dat
rm angularVelocityTemp.dat
rm data/angularVelocityTemp.dat
rm plot/*.png

So copy this code into a file called data.sh and execute after running simulation with

Code:

bash data.sh

This will write you some .dat files, that you can open/plot with matlab/ocatve/excel/whatever

I hoped this will help someone!

Cheers,
Mona

Hi, Mona!
I also try to plot the heave motion of a floating body. I follow your ideas above. After running the case, I creat a file named data.sh and copy the script into the this file. Then I run the command bash data.sh in the terminal. However, some errors happen and I get three .dat files without nothong in these files. I don't know if I am right to do so. Did I do someting wrong so that I can't get the data.
I am new here. I wish your rely, thank you!

Fieschi · February 27, 2019, 10:27

Hi Robin86,

Quote:

Originally Posted by Robin86

I get three .dat files without nothong in these files.

Try to personalise the data file by modifying the following line :

Code:

PFAD=log

For example, if your data are written in a file called log.interFoam you have to write :

Code:

PFAD=log.interFoam

Regards,
Laurent.

Robin86 · March 19, 2019, 20:28

Thank you for your reply. I already fix the problem.

AR91 · September 30, 2019, 07:01

Quote:

Originally Posted by mo_na

Hey,

for everyone struggling with the same issue: I found a shell script that writes out data from the logfile and modified it a little bit to match my needs:

Code:

#!/bin/bash

PFAD=log
EXCL=10

# cat   list a files content on a screen / in a pipeline (using "|")
# grep  returns all lines matching a certain string
# cut   cuts out e.g. fields "-f" (here 3rd until END [-]) specified through delminiter "-d' '" (here blanks)
# sed   remove complete lines containing a certain string (here "ClockTime")
# sed-i includes Header
# head  deletes last 10 lines (for scaling reasons, as last lines are often already diverged)
# tr    remove certain strings (here "(" and ")")
#paste  merge two files line by line

################ CLEAR OLD DATA ################
rm -r data

##################### TIME #####################
cat $PFAD | grep 'Time = ' | cut -d' ' -f3- | sed '/ClockTime/d' > Time.dat

############### ORIENTATION  ###############
cat $PFAD | grep 'Orientation' | cut -d' ' -f3- | tr -d '(' | tr -d ')'| tr -d 'Orientation:' | sed -e 's/[\\ \\]/      /g' > orientationTemp.dat

############### LINEAR VELOCITY ################
cat $PFAD | grep 'Linear velocity' | cut -d' ' -f3- | tr -d '(' | tr -d ')' | sed -e 's/[\\ \\]/        /g' > linearVelocityTemp.dat

############### ANGULAR VELOCITY ###############
cat $PFAD | grep 'Angular velocity' | cut -d' ' -f3- | tr -d '(' | tr -d ')' | sed -e 's/[\\ \\]/       /g' > angularVelocityTemp.dat

########## MERGE FILES & ADD HEADER ############
mkdir data
paste Time.dat orientationTemp.dat > data/orientationTemp.dat
sed -i '1i#Time, cos, 0, sin, 0, 1, 0, -sin, 0, cos' data/orientationTemp.dat
head -n -$EXCL data/orientationTemp.dat > data/orientation.dat
paste Time.dat linearVelocityTemp.dat > data/linearVelocityTemp.dat
sed -i '1i#Time, u, v, w' data/linearVelocityTemp.dat
head -n -$EXCL data/linearVelocityTemp.dat > data/linearVelocity.dat
paste Time.dat angularVelocityTemp.dat > data/angularVelocityTemp.dat
sed -i '1i#Time, p, q, r' data/angularVelocityTemp.dat
head -n -$EXCL data/angularVelocityTemp.dat > data/angularVelocity.dat
rm Time.dat
rm orientationTemp.dat
rm data/orientationTemp.dat
rm linearVelocityTemp.dat
rm data/linearVelocityTemp.dat
rm angularVelocityTemp.dat
rm data/angularVelocityTemp.dat
rm plot/*.png

So copy this code into a file called data.sh and execute after running simulation with

Code:

bash data.sh

This will write you some .dat files, that you can open/plot with matlab/ocatve/excel/whatever

I hoped this will help someone!

Cheers,
Mona

There seems to be an issue when this script copies exponents from the log file to the .dat file.
For instance: 1.34587e-18 becomes 1.34587-18.
Any help would be greatly appreciated in this regard.
Thanks,
Arun.

quarkz · February 4, 2022, 20:31

Quote:

Originally Posted by AR91

There seems to be an issue when this script copies exponents from the log file to the .dat file.
For instance: 1.34587e-18 becomes 1.34587-18.
Any help would be greatly appreciated in this regard.
Thanks,
Arun.

Hi Arun,

Just saw your msg. Actually the reason this occurs is due to:

Code:

tr -d 'Orientation:'

All the "e" are removed. Hence, you can remove that part. The word "Orientation" will be in the extracted data though.

zyfsoton · March 18, 2022, 11:31

Dear all,

I have the same question about this pitch and heave plot.

I think the sin(pitch) is the third component of the orientation vector but I have no idea how to derive the heave.

Please let me know if you have any ideas.

Many thanks,
Tony

Brandon_ · February 19, 2023, 21:31

Quote:

Originally Posted by Adri_12

Hi Mona,

I am using the new rigidBodyDynamics library instead of the classical sixDofRigidBodyMotion ?

The problem is that I do not understand how to explore the log file info since the CoG is not logged out anymore. What we have instead is a "center of rotation" but it is not the kind of point I am looking for, a CoG or a manually point to follow would be better. Here you have an example :

Code:

Courant Number mean: 0.000365065 max: 0.934088
Interface Courant Number mean: 1.39805e-05 max: 0.301043
deltaT = 0.00981865
Time = 2.43733

PIMPLE: iteration 1
forces forces:
    Not including porosity effects
Rigid-body motion of the BOAT
    Centre of rotation: (0.148519 -3.25435e-06 -0.00757061)
    Orientation: (0.999997 2.91458e-07 0.0022597 -2.91323e-07 1 -6.00382e-08 -0.0022597 5.93798e-08 0.999997)
    Linear velocity: (0.0538253 3.10699e-06 0.0702008)

Moreover, a "q" 6 dimension vector is automatically copied in the folder /uniform/rigidBodyState that seems to match with the log point info.

If you have some info about the way to extract CoG info, please share it

Adri

Hello.Recently, I am using the rigidbodymotion solver instead of SixDoFrigidbodymotion,too. I want to solve the center of mass and six degrees of freedom of the floating body and face the same problem with you. Do you have any good ideas?
Many thanks,
Brandon

Ramesh mukkund · February 25, 2024, 08:57

forgot

Quote:

Originally Posted by mo_na

Hey,

for everyone struggling with the same issue: I found a shell script that writes out data from the logfile and modified it a little bit to match my needs:

Code:

#!/bin/bash

PFAD=log
EXCL=10

# cat   list a files content on a screen / in a pipeline (using "|")
# grep  returns all lines matching a certain string
# cut   cuts out e.g. fields "-f" (here 3rd until END [-]) specified through delminiter "-d' '" (here blanks)
# sed   remove complete lines containing a certain string (here "ClockTime")
# sed-i includes Header
# head  deletes last 10 lines (for scaling reasons, as last lines are often already diverged)
# tr    remove certain strings (here "(" and ")")
#paste  merge two files line by line

################ CLEAR OLD DATA ################
rm -r data

##################### TIME #####################
cat $PFAD | grep 'Time = ' | cut -d' ' -f3- | sed '/ClockTime/d' > Time.dat

############### ORIENTATION  ###############
cat $PFAD | grep 'Orientation' | cut -d' ' -f3- | tr -d '(' | tr -d ')'| tr -d 'Orientation:' | sed -e 's/[\\ \\]/      /g' > orientationTemp.dat

############### LINEAR VELOCITY ################
cat $PFAD | grep 'Linear velocity' | cut -d' ' -f3- | tr -d '(' | tr -d ')' | sed -e 's/[\\ \\]/        /g' > linearVelocityTemp.dat

############### ANGULAR VELOCITY ###############
cat $PFAD | grep 'Angular velocity' | cut -d' ' -f3- | tr -d '(' | tr -d ')' | sed -e 's/[\\ \\]/       /g' > angularVelocityTemp.dat

########## MERGE FILES & ADD HEADER ############
mkdir data
paste Time.dat orientationTemp.dat > data/orientationTemp.dat
sed -i '1i#Time, cos, 0, sin, 0, 1, 0, -sin, 0, cos' data/orientationTemp.dat
head -n -$EXCL data/orientationTemp.dat > data/orientation.dat
paste Time.dat linearVelocityTemp.dat > data/linearVelocityTemp.dat
sed -i '1i#Time, u, v, w' data/linearVelocityTemp.dat
head -n -$EXCL data/linearVelocityTemp.dat > data/linearVelocity.dat
paste Time.dat angularVelocityTemp.dat > data/angularVelocityTemp.dat
sed -i '1i#Time, p, q, r' data/angularVelocityTemp.dat
head -n -$EXCL data/angularVelocityTemp.dat > data/angularVelocity.dat
rm Time.dat
rm orientationTemp.dat
rm data/orientationTemp.dat
rm linearVelocityTemp.dat
rm data/linearVelocityTemp.dat
rm angularVelocityTemp.dat
rm data/angularVelocityTemp.dat
rm plot/*.png

So copy this code into a file called data.sh and execute after running simulation with

Code:

bash data.sh

This will write you some .dat files, that you can open/plot with matlab/ocatve/excel/whatever

I hoped this will help someone!

Cheers,
Mona

Hi mona,
I'm running floatingObject (2d case) using olaFlow and I'm able to run simulation successfully. while i was trying to plot surge, heave plot i used your script with just modifying 'log' to 'olaDyMFoam.log' , and then running ' bash data.sh' , i got this msg. I couldn't get this msg what I'm doing wrong. can u please help me to figure it out.
this is what i got after running 'bash data.sh'

Ramesh mukkund · February 25, 2024, 09:00

Quote:

Originally Posted by Ramesh mukkund

forgot
Hi mona,
I'm running floatingObject (2d case) using olaFlow and I'm able to run simulation successfully. while i was trying to plot surge, heave plot i used your script with just modifying 'log' to 'olaDyMFoam.log' , and then running ' bash data.sh' , i got this msg. I couldn't get this msg what I'm doing wrong. can u please help me to figure it out.
this is what i got after running 'bash data.sh'

ramesh@DESKTOP-L0H8LQ0:~/olaFlow/tutorials/Floating_barge$ bash data.sh
cat: olaDyMFlow.log: No such file or directory
cat: olaDyMFlow.log: No such file or directory
cat: olaDyMFlow.log: No such file or directory
cat: olaDyMFlow.log: No such file or directory
cat: olaDyMFlow.log: No such file or directory
paste: CentreofmassTemp.dat: No such file or directory
rm: cannot remove 'CentreofmassTemp.dat': No such file or directory
rm: cannot remove 'plot/*.png': No such file or directory

Ramesh mukkund · February 25, 2024, 15:29

Quote:

Originally Posted by Ramesh mukkund

ramesh@DESKTOP-L0H8LQ0:~/olaFlow/tutorials/Floating_barge$ bash data.sh
cat: olaDyMFlow.log: No such file or directory
cat: olaDyMFlow.log: No such file or directory
cat: olaDyMFlow.log: No such file or directory
cat: olaDyMFlow.log: No such file or directory
cat: olaDyMFlow.log: No such file or directory
paste: CentreofmassTemp.dat: No such file or directory
rm: cannot remove 'CentreofmassTemp.dat': No such file or directory
rm: cannot remove 'plot/*.png': No such file or directory

issue solved.

May 2, 2016, 06:15	How to plot pitch motion for free decay test?	#1
mo_na Member Mona Join Date: Mar 2016 Location: Berlin Posts: 49 Rep Power: 10	Hi all, I am simulating a floating body in pitch motion and I would like to do a free decay test to compare with experimental results. I am using a moving mesh and the log file contains information like this: Code: 6-DoF rigid body motion Centre of rotation: (0 0 0) Centre of mass: (0.58783434026 0 -0.181372871211) Orientation: (0.995632340385 0 0.0933608203665 0 1 0 -0.0933608203665 0 0.995632340385) Linear velocity: (0 0 0) Angular velocity: (0 0.0586546346079 0) Is there a way to write the orientation of the body in a separate file to plot the pitch motion after? Or is there maybe another way? Cheers, Mona

May 27, 2016, 06:45	Ideas	#4
mo_na Member Mona Join Date: Mar 2016 Location: Berlin Posts: 49 Rep Power: 10	Hi all, I have some ideas now how to do it but I am not quite there yet. In this thread simon-2 describes a way to obtain sixDoFRigidBodyMotionState files for each timestep: http://www.cfd-online.com/Forums/ope...tml#post601930 He said it was just a matter of batch processing to write all the information into one file so you obtain a file like this: Code: #time centreOfMass orientation velocity acceleration angularMomentum Torque 80.0199 ( 3.3 0 0.1386375 ) ( 0.99807619 0 0.061999301 0 1 0 -0.061999301 0 0.99807619 ) ( 0 0 0.0045163445 ) ( 1.3211615 -2.6233042 0.84606626 ) ( 0 -0.2529557 0 ) ( 1109.8274 99.511973 -24.488035 ) 80.0298 ( ... ... ... ) (.. ... ... .. .. .. .. .. ..) (.. .. ..) (.. .. ..) (... .. ..) 80.0398 ( ... ... ... ) (.. ... ... .. .. .. .. .. ..) (.. .. ..) (.. .. ..) (... .. ..) 80.0497 ( ... ... ... ) (.. ... ... .. .. .. .. .. ..) (.. .. ..) (.. .. ..) (... .. ..) But I havn't figured out how to do it. I also found this python-script: https://github.com/kodejak/openfoam-data-extractor This script extracts searched datas from the OpenFOAM project generated files e.g. gravity, centreOfMass etc. The datas will be stored as a CSV file located at the directory of the script, named like the command line search pattern. But then I still need to do this for every single sixDoFRigidBodyMotionState file and thats a lot. Any ideas? Cheers, Mona

November 23, 2016, 05:04		#6
havref New Member Håvard B. Refvik Join Date: Jun 2015 Location: Norway Posts: 17 Rep Power: 10	Exactly what I have been searching for. Thanks! Last edited by havref; November 24, 2016 at 06:10.

October 16, 2018, 12:09		#7
Adri_12 New Member Adri Join Date: Sep 2017 Posts: 24 Rep Power: 8	Hi Mona, I am using the new rigidBodyDynamics library instead of the classical sixDofRigidBodyMotion ? The problem is that I do not understand how to explore the log file info since the CoG is not logged out anymore. What we have instead is a "center of rotation" but it is not the kind of point I am looking for, a CoG or a manually point to follow would be better. Here you have an example : Code: Courant Number mean: 0.000365065 max: 0.934088 Interface Courant Number mean: 1.39805e-05 max: 0.301043 deltaT = 0.00981865 Time = 2.43733 PIMPLE: iteration 1 forces forces: Not including porosity effects Rigid-body motion of the BOAT Centre of rotation: (0.148519 -3.25435e-06 -0.00757061) Orientation: (0.999997 2.91458e-07 0.0022597 -2.91323e-07 1 -6.00382e-08 -0.0022597 5.93798e-08 0.999997) Linear velocity: (0.0538253 3.10699e-06 0.0702008) Moreover, a "q" 6 dimension vector is automatically copied in the folder /uniform/rigidBodyState that seems to match with the log point info. If you have some info about the way to extract CoG info, please share it Adri

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May 24, 2016, 04:40		#3
mo_na Member Mona Join Date: Mar 2016 Location: Berlin Posts: 49 Rep Power: 10	Hi Hao, no I havn't managed yet. Do you have an idea how to do it or do you want me to tell you as soon as I figured it out? Cheers, Mona

March 19, 2019, 20:28		#10
Robin86 New Member Luo_Bingjun Join Date: Oct 2018 Location: CHINA Posts: 14 Rep Power: 7	Thank you for your reply. I already fix the problem.

March 18, 2022, 11:31		#13
zyfsoton Member Tony Zhang Join Date: Nov 2019 Location: soton Posts: 45 Rep Power: 6	Dear all, I have the same question about this pitch and heave plot. I think the sin(pitch) is the third component of the orientation vector but I have no idea how to derive the heave. Please let me know if you have any ideas. Many thanks, Tony