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How to output variables every time step?

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Old   January 15, 2001, 20:08
Default How to output variables every time step?
  #1
Dazhi Guo
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Hi,all, I want to output the coordinats and fluid velocity of all nodes "every time step". It seems the UDF DEFINE_ADJUST and DEFINE_RW_FILE can do that job. Could you give me some advice on how to do that with these two UDFs or any other method? Thanks a lot. Guo
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Old   January 15, 2001, 20:22
Default Re: How to output variables every time step?
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Trac
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Hi Guo,

You may also be able to do this using macros (solve --> monitors --> command). You should be able to set something up to write all the values you need to a particular file type at each time step, probably using "export".

Trac.
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Old   January 15, 2001, 21:47
Default Re: How to output variables every time step?
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Dazhi Guo
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Thank you tracie, I tried your method. It's working pretty well. But the problem now is I got so many big files which are going to kill my harddrive. What I need is to handle one set of data and delete it to make room for next one every time step. I still need to write a User Defined Function to work with the Fluent solver at the same time. Any info. is appreciated. Guo
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Old   January 15, 2001, 22:07
Default Re: How to output variables every time step?
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Trac
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Hi Guo,

Can you explain what you are doing a bit more - are you getting Fluent to read the file back in? Is it possible to just give the file the same name, so it overwrites the old one each time?

Trac.
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Old   January 16, 2001, 12:17
Default Re: How to output variables every time step?
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Dazhi Guo
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Yes,tracie,I want fluent to read that file in. Actually I need a subroutine or UDF to read that back. We can not change the Discrete Phase Model(DPM) with the FLUENT. So I have to write a UDF to calculate the particle phase. Now no coupling is considered and I don't need to put any effect of the particle back to the fluid phase. I am sure FLUENT has supplied the IO head files such as "stdio.h" in C language. The manual for that part is also confusing. Only one function DEFINE_RW_FILE(FILE *fp) is available. I tried that but it didn't work.
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