Apply Profile file over the mesh

cris · September 1, 2011, 10:23

Hi , i would like to know if it is possible to read a profile file over an entire mesh. I have a set of pressure measuraments and i have all the values corresponding to the nodes of a mesh.(done with matlab)Now i want to import them (written in the form of a profile file )into the fluent mesh.

To test the procedure i have taken a profile file of velocity from a simulation and i tried to read it in the same mesh from which it was generated.I read throgh BC and applied to the inlet velocity (as the interior surface -mesh doesn t take it), i initialised the simulation and run few steps but the countorn plot doesn t look as the original.

hope someone has ideas of what i m doing wrong. Thanks

cris · September 5, 2011, 13:24

Hi i have found some sort of solution to import data into a mesh, it seems to work for steady cases but not for transient, i have saved all the profile file for all the bc and i did attach them into the new bc. Anyone kwos a better way of importing data? Pleease any suggestions are more than appreciated

mecarlg · September 17, 2011, 20:52

Hi Chris,

I have a similar problem to you. I have experimentally measured radiation in a narrow band in the upper region of a room. Basically I need to put a series of 2D contour plots of the radiation distribution in the region of interest.

Looking at section 7.27 of the fluent (6.3) manual ("Fixing the values of variables"), you can do this by reading in a suitable profile file. Next you click on the appropriate cell zone (for you I guess this would be the whole fluid volume) then turn on the fixed values option, click the fixed values tab and then add your profile to pressure.

If you do this then Fluent doesn't solve the transport equation for the quantity you are fixing which is pretty neat. I haven't tried it yet because I'm not in the office until Monday but looks like it should work.

Good luck!

Carlos.

cris · September 19, 2011, 08:24

Thanks i tried and it is working , i just initialise the data and i run just few time step to be sure and i have the same countorn profile as the original.

Anyway if you are working with the workbench you can do it by using cfx, i did it by writing the profile file as a csv file and i imported it in cfx, then i initialise from profile data and i exported the solution as a cngs file. Then i imported the cgns in fluent , bit of more road to go but it works as well.

cris · September 20, 2011, 10:38

hi carlos have you been able to import radiation in fluent, i used the procedure you suggested with a profile of velocity but with the pressure it doesn t work as i cannot fix the value of pressure.How did you have done with radiation?thanks

dengdeng · June 28, 2020, 14:20

Hi, I'm facing at a similar problem, however, when I edit the cell zone conditions, the "fixed values" icon is grey, which means I'm not allowed to choose this option. Do you have any idea of solving such a problem?

Some setups of my case (a 3D model) are as follows:

- density-based solver
- energy equation on
- air model: air ideal gas

Thanks in advance : D

---------------------------------------------------------------------

According to the Fluent User's Guide, this "fixing the values of variables" option could only be appied to pressure-based solver.

AlexanderZ · June 30, 2020, 01:32

Quote:

Originally Posted by dengdeng

Hi, I'm facing at a similar problem, however, when I edit the cell zone conditions, the "fixed values" icon is grey, which means I'm not allowed to choose this option. Do you have any idea of solving such a problem?

Some setups of my case (a 3D model) are as follows:

- density-based solver
- energy equation on
- air model: air ideal gas

Thanks in advance : D

---------------------------------------------------------------------

According to the Fluent User's Guide, this "fixing the values of variables" option could only be appied to pressure-based solver.

use pressure-based solver

September 1, 2011, 10:23	Import external data over the mesh	#1
cris New Member Join Date: Mar 2011 Posts: 5 Rep Power: 15	Hi , i would like to know if it is possible to read a profile file over an entire mesh. I have a set of pressure measuraments and i have all the values corresponding to the nodes of a mesh.(done with matlab)Now i want to import them (written in the form of a profile file )into the fluent mesh. To test the procedure i have taken a profile file of velocity from a simulation and i tried to read it in the same mesh from which it was generated.I read throgh BC and applied to the inlet velocity (as the interior surface -mesh doesn t take it), i initialised the simulation and run few steps but the countorn plot doesn t look as the original. hope someone has ideas of what i m doing wrong. Thanks Last edited by cris; September 1, 2011 at 14:42.

September 17, 2011, 20:52	Set fixed values in cell zone.	#3
mecarlg New Member Carl Join Date: Mar 2009 Location: United Kingdom Posts: 13 Rep Power: 17	Hi Chris, I have a similar problem to you. I have experimentally measured radiation in a narrow band in the upper region of a room. Basically I need to put a series of 2D contour plots of the radiation distribution in the region of interest. Looking at section 7.27 of the fluent (6.3) manual ("Fixing the values of variables"), you can do this by reading in a suitable profile file. Next you click on the appropriate cell zone (for you I guess this would be the whole fluid volume) then turn on the fixed values option, click the fixed values tab and then add your profile to pressure. If you do this then Fluent doesn't solve the transport equation for the quantity you are fixing which is pretty neat. I haven't tried it yet because I'm not in the office until Monday but looks like it should work. Good luck! Carlos.

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September 5, 2011, 13:24		#2
cris New Member Join Date: Mar 2011 Posts: 5 Rep Power: 15	Hi i have found some sort of solution to import data into a mesh, it seems to work for steady cases but not for transient, i have saved all the profile file for all the bc and i did attach them into the new bc. Anyone kwos a better way of importing data? Pleease any suggestions are more than appreciated

September 19, 2011, 08:24		#4
cris New Member Join Date: Mar 2011 Posts: 5 Rep Power: 15	Thanks i tried and it is working , i just initialise the data and i run just few time step to be sure and i have the same countorn profile as the original. Anyway if you are working with the workbench you can do it by using cfx, i did it by writing the profile file as a csv file and i imported it in cfx, then i initialise from profile data and i exported the solution as a cngs file. Then i imported the cgns in fluent , bit of more road to go but it works as well.

September 20, 2011, 10:38		#5
cris New Member Join Date: Mar 2011 Posts: 5 Rep Power: 15	hi carlos have you been able to import radiation in fluent, i used the procedure you suggested with a profile of velocity but with the pressure it doesn t work as i cannot fix the value of pressure.How did you have done with radiation?thanks

June 28, 2020, 14:20		#6
dengdeng New Member Join Date: Apr 2017 Posts: 20 Rep Power: 9	Hi, I'm facing at a similar problem, however, when I edit the cell zone conditions, the "fixed values" icon is grey, which means I'm not allowed to choose this option. Do you have any idea of solving such a problem? Some setups of my case (a 3D model) are as follows: - density-based solver - energy equation on - air model: air ideal gas Thanks in advance : D --------------------------------------------------------------------- According to the Fluent User's Guide, this "fixing the values of variables" option could only be appied to pressure-based solver.