UDF gives an empty file !!

Saidul · February 10, 2015, 18:35

Yes, I did and that is why, there is no way to overwrite the data in a same file. Every time I changed the name of the file. Could you please give me any idea what is happening?

Thanks a lot.

Quote:

Originally Posted by pakk

Do you remove "Z:\\dpm_coordinates_10feb_xyz.txt" every time before you start the simulation?

pakk · February 11, 2015, 05:47

I have no idea.

If you did what I expect you did, it is very strange. But let me summarize what I think you did, to see if I understand it correctly.

- You have a Fluent case, where the flow solution has already converged.
- In that case, you added an injection on an inlet, that has 1054 faces. (You said "nodes", but if you choose "surface" for injection, Fluent uses face centers.)
- You compiled the UDF you showed before.
- You set the dpm-boundary condition of some walls to "dpm_coordinates_10feb". No other boundary was set to "trap".
- You made sure the text file was empty/not existing.
- You went to "graphics and animations" - "Particle tracks"
- You selected the injection you added, and tracked the particles.
- Fluent gave a message that 1054 particles were released, and 156 were trapped. The other 998 were either escaped, or unfinished.
- You opened the text files that were being written to (Z:\\dpm_coordinates_10feb_xyz.txt and the other one.)
- That text file should have 156 lines, but instead you see many more.

Are these the steps you took? If not, please describe your steps in the same detail.

Saidul · February 11, 2015, 19:02

Hello,
I did almost same thing. I used "surface" for injection type and release from surface is "inlet". Yes, it seems very strange. Can I send you my cas file, then you can have a look. If I set the boundary condition as "trap" (without UDF) then it show how many particles are trapped. When I compile the UDF and activate it, console shows how many particle aborted. But the file gives lots of coordinates.

Thank you very much for your help.

Saidul

Quote:

Originally Posted by pakk

I have no idea.

If you did what I expect you did, it is very strange. But let me summarize what I think you did, to see if I understand it correctly.

- You have a Fluent case, where the flow solution has already converged.
- In that case, you added an injection on an inlet, that has 1054 faces. (You said "nodes", but if you choose "surface" for injection, Fluent uses face centers.)
- You compiled the UDF you showed before.
- You set the dpm-boundary condition of some walls to "dpm_coordinates_10feb". No other boundary was set to "trap".
- You made sure the text file was empty/not existing.
- You went to "graphics and animations" - "Particle tracks"
- You selected the injection you added, and tracked the particles.
- Fluent gave a message that 1054 particles were released, and 156 were trapped. The other 998 were either escaped, or unfinished.
- You opened the text files that were being written to (Z:\\dpm_coordinates_10feb_xyz.txt and the other one.)
- That text file should have 156 lines, but instead you see many more.

Are these the steps you took? If not, please describe your steps in the same detail.

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February 11, 2015, 05:47		#22
pakk Senior Member Join Date: Nov 2013 Posts: 1,965 Rep Power: 27	I have no idea. If you did what I expect you did, it is very strange. But let me summarize what I think you did, to see if I understand it correctly. - You have a Fluent case, where the flow solution has already converged. - In that case, you added an injection on an inlet, that has 1054 faces. (You said "nodes", but if you choose "surface" for injection, Fluent uses face centers.) - You compiled the UDF you showed before. - You set the dpm-boundary condition of some walls to "dpm_coordinates_10feb". No other boundary was set to "trap". - You made sure the text file was empty/not existing. - You went to "graphics and animations" - "Particle tracks" - You selected the injection you added, and tracked the particles. - Fluent gave a message that 1054 particles were released, and 156 were trapped. The other 998 were either escaped, or unfinished. - You opened the text files that were being written to (Z:\\dpm_coordinates_10feb_xyz.txt and the other one.) - That text file should have 156 lines, but instead you see many more. Are these the steps you took? If not, please describe your steps in the same detail.