CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Post-Processing

average velocity on blade

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree2Likes
  • 1 Post By kandelabr
  • 1 Post By wyldckat

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   January 14, 2019, 13:31
Default average velocity on blade
  #1
Member
 
sajad alimardani
Join Date: Feb 2018
Posts: 30
Rep Power: 5
sajjjad is on a distinguished road
hi
I simulate transient flow around of the propeller(pimpleDymFoam) and compare with steady data.
my result Component velocity on the slice blade so different with
Experimental results( Experimental results is steady state).


i use average-field for this.
clip/clip/slice/plotintersictioncurve/ U_xmean ,U_ymean... so different

Somebody has an idea.

thank you.
sajjad
/* fieldAverage1
{
type fieldAverage;
functionObjectLibs ( "libfieldFunctionObjects.so" );
enabled false;
outputControl outputTime;

fields
(
U
{
mean on;
prime2Mean on;
base time;
}

p
{
mean on;
prime2Mean on;
base time;

Last edited by sajjjad; January 15, 2019 at 08:48.
sajjjad is offline   Reply With Quote

Old   January 15, 2019, 12:50
Default
  #2
Member
 
sajad alimardani
Join Date: Feb 2018
Posts: 30
Rep Power: 5
sajjjad is on a distinguished road
hi my friends

I think the fieldAverage code is based on the location and not the cell's index. That is, the mean values do not fluctuate with the propeller and are specific to the same place
how can use average field on dynamic mesh??????????



thank you

sajjad

Last edited by sajjjad; January 16, 2019 at 02:54.
sajjjad is offline   Reply With Quote

Old   January 16, 2019, 06:52
Default
  #3
Senior Member
 
kandelabr's Avatar
 
Nejc
Join Date: Feb 2017
Location: Slovenia
Posts: 167
Rep Power: 6
kandelabr is on a distinguished road
You can specify surfaceFieldValue on a patch:

Code:
type surfaceFieldValue;
operation average;
fields (p);
writeFields no;
regionType patch;
name blade;
sajjjad likes this.
kandelabr is offline   Reply With Quote

Old   January 16, 2019, 12:03
Default
  #4
Member
 
sajad alimardani
Join Date: Feb 2018
Posts: 30
Rep Power: 5
sajjjad is on a distinguished road
Quote:
Originally Posted by kandelabr View Post
You can specify surfaceFieldValue on a patch:

Code:
type surfaceFieldValue;
operation average;
fields (p);
writeFields no;
regionType patch;
name blade;
hi
thank Nejc for ripely.I'm sorry. i explain my problem Incomplete.
i want average not on the blade.in fact on the slice radial(such this picture)


sajjad
thank you.
Attached Images
File Type: jpg photo_2019-01-16_20-31-27.jpg (12.8 KB, 7 views)
sajjjad is offline   Reply With Quote

Old   January 20, 2019, 16:03
Default
  #5
Retired Super Moderator
 
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 10,962
Blog Entries: 45
Rep Power: 123
wyldckat is a name known to allwyldckat is a name known to allwyldckat is a name known to allwyldckat is a name known to allwyldckat is a name known to allwyldckat is a name known to all
Since I couldn't find a thread on this, I'm post here the answer to the following PM from sajjjad:
Quote:
Originally Posted by sajjjad
hi Bruno
what is Axial and tangentialand radius speed in the propeller?
thank you.
sajjad
Quick answer:
  1. Quoting here: https://pingpong.chalmers.se/public/...ingOFW11-1.pdf
    Quote:
    The convertToCylindrical utility
    Converts U to Urel. Note that Z-axis must be the center axis of rotation, but you can easily make it general with the cylindricalCS class in $FOAM_SRC/OpenFOAM/coordinateSystems
  2. A few more details about the utility: https://openfoamwiki.net/index.php/S...tem_Converters
  3. There is a somewhat more recent version of this utility here: https://github.com/engenegr/convertToCylindrical
sajjjad likes this.
__________________
wyldckat is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
how to calculate water average velocity in free surface models hmasenger CFX 22 October 30, 2019 19:28
Average velocity of two different planes niqbal OpenFOAM Post-Processing 6 June 19, 2017 06:08
Finding Average velocity between two plates EP3engineer CFX 2 January 31, 2015 12:47
Troubleshooting probe and average functions with Angular Velocity siardica CFX 20 October 7, 2013 06:54
how to get average velocity in a given domain W. W. Zhang FLUENT 1 May 6, 2007 12:25


All times are GMT -4. The time now is 15:28.