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-   -   Apply Profile file over the mesh (http://www.cfd-online.com/Forums/fluent/92073-apply-profile-file-over-mesh.html)

cris September 1, 2011 09:23

Import external data over the mesh
 
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 12:24

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 19:52

Set fixed values in cell zone.
 
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 07:24

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 09:38

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


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