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UDF to switch on energy equation after X iteration

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Old   December 3, 2005, 12:29
Default UDF to switch on energy equation after X iteration
  #1
mat w
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Hi all, does anyone have a UDF that I could use to switch on the energy equation on a problem after, say 500 iterations? Or even better, one that switches the energy equation on after the continuity residual hits 1e-6? It would save me lots of time when running problems over night.

Any help or advice much appreciated.

Thanks, mat
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Old   December 5, 2005, 02:28
Default Re: UDF to switch on energy equation after X itera
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nasser
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plz more explain do you want to enable energy equation after 500 iter?

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Old   December 5, 2005, 04:40
Default Re: UDF to switch on energy equation after X itera
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mat w
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That's right nasser - I want to "enable" or turn on the energy equation (Solve-Controls-Solution) after say 500 equations. It would be even better if I could switch on the energy equation after the continuity residuals reduced to below a certain level.

thanks mat
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Old   December 5, 2005, 05:23
Default Re: UDF to switch on energy equation after X itera
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nasser
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Do you use segregated model? if you use this model you can. use under relaxtation method bye
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Old   December 5, 2005, 05:36
Default Re: UDF to switch on energy equation after X itera
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mat w
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I am using a segregated solver, but how will the "under relaxation method" help?

I'm not sure what you mean exactly - a UDF is required in order to automatically enable the energy equation after a certain number of residuals, I'm just not sure how to write it.

Thanks anyway, mat
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Old   December 5, 2005, 08:26
Default Re: UDF to switch on energy equation after X itera
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steph
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Hello, you needn't UDF ... you can use a file.jou :

/file/read-case toto.cas.gz

/file/read-data toto.dat.gz

;; you do 500 iterations ...

/solve/iterate 500

;; ... after you switch on energy equation

/define/models/energy? yes

/solve/iterate 1500

/file/write-data toto_end.dat.gz

steph.
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Old   December 5, 2005, 08:35
Default Re: UDF to switch on energy equation after X itera
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mat w
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Steph,

Thanks for that-sounds good. I'll give it a whirl.

Cheers for the help - it'll save me lots of time.

Mat w
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