how to create .def file in cfx

krishna · July 16, 2010, 13:01

hi

I am doing analysis over the car body in ANSYS 12.0 CFX ,
I have chosen symmetry for the car model and have created a domain with inlet, outlet, symmetry wall, free walls and the car body. I have applied all the boundary conditions in the CFX - PRE stage.

Now how can I write SOLVER (. def ) File and how to run the process.

Please any one help me in this regard.

thank you

CCTech_Pune · July 17, 2010, 07:21

go to Tools>Solve>Write Solver input file

Start solver manager, select the definition file to solve it. More details in help manual!

krishna · July 17, 2010, 19:35

ok

thanks a lot

krishna · July 17, 2010, 19:38

hi

i have tried it, but the solve option is not highlited, what should i do

thank you

ghorrocks · July 18, 2010, 06:19

Work through the tutorials. This is pretty basic stuff.

TommySean · July 18, 2010, 10:45

In CFX12, you should insert an execution control and a configuration. The configuration will define which flow analysis will run in what sequence. The execution control will define path and name of your def file.

krishna · July 18, 2010, 15:50

ok

thanks a lot i have got the results,

actually i have designed a basic race car in Pro - E
my project is to compare two softwares Phoenics and Ansys ( fluent or cfx)

i have done the analysis in Phoenics and have got max pressure value as 650 Pa for 31.30 m/s and for 300 iterations and i got drag coefficient value as 0.36

(domains are not same )

but in fluent and CFX i have done my analysis for the same speed and iterations but the maximum pressure is 1114 Pa

so i have struck in the middle and more over in fluent or CFX can we find drag coefficient...........?

please help me in this regard

thank you

ghorrocks · July 18, 2010, 19:14

Is maximum pressure important?

Drag coefficient is probably more important. Do you have experiments to compare against? If not, you should get some benchmark cases (maybe the Ahmed test body) and make sure you can model that accurately before you compare CFD codes.

krishna · July 19, 2010, 03:40

ok glenn

i will check it once

thanks a lot

mechy · June 29, 2012, 09:19

Quote:

Originally Posted by krishna

hi

i have tried it, but the solve option is not highlited, what should i do

thank you

Dear krishna

I have the same problem and my solve option is not highlighted what should I do ?

Best Regards

lffabiani · June 29, 2012, 15:16

Are you running the CFX pre inside Workbench??

If yes, the write def file for solver wont be available. You should add another block for the solver and drag the case file into it.

mechy · June 30, 2012, 00:29

Dear Fabiani
I use the ANSYS workbench 14
I do not understand what should I do
please explain clearly
what is the block ? your mean is another CFX solver ?

Best Regards

lffabiani · June 30, 2012, 10:33

Sorry, Its been so long since I used workbench that I forgot.

In the "CFX" block you should click on "Setup" to enter the CFX-Pre and just setup your case. After that just close the CFX-pre window, and on Workbech double click on the "Solution" item on the CFX block.

This will start the solver, you dont need to write a def file this way, only if you are running CFX outside the workbench environment

mechy · June 30, 2012, 14:12

Quote:

Originally Posted by lffabiani

Sorry, Its been so long since I used workbench that I forgot.

In the "CFX" block you should click on "Setup" to enter the CFX-Pre and just setup your case. After that just close the CFX-pre window, and on Workbech double click on the "Solution" item on the CFX block.

This will start the solver, you dont need to write a def file this way, only if you are running CFX outside the workbench environment

Dear Fabiani
I know that I need to create .def file for run the example Example Simulation of a Piezoelectric Actuated Micro-Pump" which exist in help

are you simulate this example ?

lffabiani · June 30, 2012, 14:15

You only need to create a .def file when running a stand alone CFX Pre (which I prefer)

When running inside Workbech, the .def file will be created automatically. After setting up the case on CFX-pre, just double cick the "solver" item on workbench

imnull · January 18, 2013, 11:01

Hi All,
question:
does CFX write a licence information to *.DEF file?
the reason I ask is that-I was told that by Cluster' Administrator that I can not use *.DEF file which was created on another licence (PC). Thanks

lffabiani · January 18, 2013, 11:07

Maybe he means that it is in a different version (def file CFX version newer than cluster version ).

Never heard that CFX writes licence info on def files, It doesn't make much sense doing so.

imnull · January 18, 2013, 12:15

Quote:

Originally Posted by lffabiani

Maybe he means that it is in a different version (def file CFX version newer than cluster version ).

Never heard that CFX writes licence info on def files, It doesn't make much sense doing so.

thanks.
Admin also commented that hardware problems can also rise - so I assume that something goes to def..

cdegroot · January 18, 2013, 22:08

Def file will not contain any licence information and can be transferred between different platforms. I often make them in Linux and run on Windows or vice versa. The only problem would be if it was created with a different version. I think they are supposed to be backwards compatible, but if you use a newer version it may not work with an older version of the solver if the feature you are trying to use is not available.

July 16, 2010, 13:01	how to create .def file in cfx	#1
krishna New Member Join Date: May 2010 Posts: 17 Rep Power: 15	hi I am doing analysis over the car body in ANSYS 12.0 CFX , I have chosen symmetry for the car model and have created a domain with inlet, outlet, symmetry wall, free walls and the car body. I have applied all the boundary conditions in the CFX - PRE stage. Now how can I write SOLVER (. def ) File and how to run the process. Please any one help me in this regard. thank you

July 17, 2010, 07:21	How to write definition file	#2
CCTech_Pune New Member CCTech Join Date: Jul 2010 Posts: 20 Rep Power: 15	go to Tools>Solve>Write Solver input file Start solver manager, select the definition file to solve it. More details in help manual! njdyck likes this.

January 18, 2013, 11:01	.def	#16
imnull Member Dmitry Join Date: Nov 2011 Posts: 45 Rep Power: 14	Hi All, question: does CFX write a licence information to .DEF file? the reason I ask is that-I was told that by Cluster' Administrator that I can not use .DEF file which was created on another licence (PC). Thanks

January 18, 2013, 11:07		#17
lffabiani Member Luis Filipe Fabiani Join Date: Apr 2009 Posts: 43 Rep Power: 17	Maybe he means that it is in a different version (def file CFX version newer than cluster version ). Never heard that CFX writes licence info on def files, It doesn't make much sense doing so. Last edited by lffabiani; January 19, 2013 at 21:08.

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July 17, 2010, 19:35		#3
krishna New Member Join Date: May 2010 Posts: 17 Rep Power: 15	ok thanks a lot

July 17, 2010, 19:38		#4
krishna New Member Join Date: May 2010 Posts: 17 Rep Power: 15	hi i have tried it, but the solve option is not highlited, what should i do thank you

July 18, 2010, 06:19		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	Work through the tutorials. This is pretty basic stuff.

July 18, 2010, 10:45		#6
TommySean New Member Tommy Join Date: Jul 2010 Posts: 10 Rep Power: 15	In CFX12, you should insert an execution control and a configuration. The configuration will define which flow analysis will run in what sequence. The execution control will define path and name of your def file.

July 18, 2010, 15:50		#7
krishna New Member Join Date: May 2010 Posts: 17 Rep Power: 15	ok thanks a lot i have got the results, actually i have designed a basic race car in Pro - E my project is to compare two softwares Phoenics and Ansys ( fluent or cfx) i have done the analysis in Phoenics and have got max pressure value as 650 Pa for 31.30 m/s and for 300 iterations and i got drag coefficient value as 0.36 (domains are not same ) but in fluent and CFX i have done my analysis for the same speed and iterations but the maximum pressure is 1114 Pa so i have struck in the middle and more over in fluent or CFX can we find drag coefficient...........? please help me in this regard thank you

July 18, 2010, 19:14		#8
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	Is maximum pressure important? Drag coefficient is probably more important. Do you have experiments to compare against? If not, you should get some benchmark cases (maybe the Ahmed test body) and make sure you can model that accurately before you compare CFD codes.

July 19, 2010, 03:40		#9
krishna New Member Join Date: May 2010 Posts: 17 Rep Power: 15	ok glenn i will check it once thanks a lot

June 29, 2012, 15:16		#11
lffabiani Member Luis Filipe Fabiani Join Date: Apr 2009 Posts: 43 Rep Power: 17	Are you running the CFX pre inside Workbench?? If yes, the write def file for solver wont be available. You should add another block for the solver and drag the case file into it.

June 30, 2012, 00:29		#12
mechy Senior Member Join Date: Jun 2011 Posts: 163 Rep Power: 14	Dear Fabiani I use the ANSYS workbench 14 I do not understand what should I do please explain clearly what is the block ? your mean is another CFX solver ? Best Regards

June 30, 2012, 10:33		#13
lffabiani Member Luis Filipe Fabiani Join Date: Apr 2009 Posts: 43 Rep Power: 17	Sorry, Its been so long since I used workbench that I forgot. In the "CFX" block you should click on "Setup" to enter the CFX-Pre and just setup your case. After that just close the CFX-pre window, and on Workbech double click on the "Solution" item on the CFX block. This will start the solver, you dont need to write a def file this way, only if you are running CFX outside the workbench environment

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June 30, 2012, 14:15		#15
lffabiani Member Luis Filipe Fabiani Join Date: Apr 2009 Posts: 43 Rep Power: 17	You only need to create a .def file when running a stand alone CFX Pre (which I prefer) When running inside Workbech, the .def file will be created automatically. After setting up the case on CFX-pre, just double cick the "solver" item on workbench

January 18, 2013, 22:08		#19
cdegroot Senior Member Chris DeGroot Join Date: Nov 2011 Location: Canada Posts: 414 Rep Power: 17	Def file will not contain any licence information and can be transferred between different platforms. I often make them in Linux and run on Windows or vice versa. The only problem would be if it was created with a different version. I think they are supposed to be backwards compatible, but if you use a newer version it may not work with an older version of the solver if the feature you are trying to use is not available.