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Topics - piso

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Where do I enter radiation properties such as emissivity/absorptivity etc.? Are there any recommended values for certain surfaces? How can I find them?

Please reply.

Thank you.

I want to calculate the volume occupied by particles in each cell. I know it can be done using UDF, but I can not figure out how to do it. Can any one guide me?



I am getting a very high tangential velocity profile magnitude in Fluent. The flow is highly swirling flow. I can not understand why this is happening. I am using RSM with second order upwind scheme for turbulence.

I would appreciate any help in this matter.

Thank you in advance.


For a steady state flow simulation, how do I create an animation of particle tracks?
In FLUENT I can display the particle tracks in pulse mode. However, FLUENT doesn't have an inbuilt function to save the animation of particle tracks which you see in pulse mode. Is there any way I can create an animation of the particle tracks?

Thank you.

Meshing / Help in meshing using GAMBIT!
« on: January 23, 2012, 08:53:49 PM »
Hi all,

I am trying to make a mesh file of the geometry shown in the attachment. When I export the mesh file and open it in Fluent, it makes a wall at the face shown in the attachment. How can I make it hollow so that fluid can pass through it

Please help me!

Thank you.

Fluent / UDF at wick/vapor interface
« on: January 21, 2012, 12:16:48 PM »

I am trying to solve a heat transfer problem at the surface of a wick. In that, I wanted to apply the boundary condition at the wick/vapour interface (considered as spherical boundary) as given in the attachment. Can anybody help me in this?

Thank you.

Fluent / Solution here to UDF compiling Error - nmake
« on: January 20, 2012, 09:35:38 AM »
I just want to share my experience in compiling UDF on windows platform. Many users find it very difficult to compile UDF on Fluent. The first error they get is that:

''nmake' is not recognized as an internal or external command, operable program or batch file. 'nmake' is not recognized as an internal or external command, operable program or batch file.'

I am sharing a PDF that shows how to compile UDF.

Another issue most users get is:
"Error: open_udf_library: The operation completed successfully."

This error happens when you are compiling a .c udf file which is not in the same directory where you have the case and data files of Fluent. It may also occur when you have a - or space in the filename of the UDF or the Fluent case and data file or you have a space or - in the directory where you have these files. So make sure that filenames and directory names do not contain spaces and dashes.

Matlab / How do I export MATLAB results to MS excel
« on: January 17, 2012, 08:03:50 PM »
How do I export the results of MATLAB to excel? I have time, temperature and velocity values in three columns. I want to export the values to Excel. Can anyone help me in this?


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