# time-averaging transient results

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 May 8, 2004, 01:45 time-averaging transient results #1 azmir Guest   Posts: n/a Hello all! I've been trying to search for a method in Star to time-average transient results for unsteady flows. I went through the archives and still reading after a few hours. Maybe this has been explained before but if you don't mind, kindly tell me how do this time-averaging of transient results this time. Is this available in GUI? If not, do tell.

 May 8, 2004, 15:44 Re: time-averaging transient results #2 Jörn Beilke Guest   Posts: n/a This is an example of prostar macro which I got from Paco who works for the support team in Nürnberg. The example I was working with had 107 time steps (beginning from iteration 2 and increments of 2): !First loading the pstt file! trload,druck.pstt,nomvgr,,c store,iter,2 !We could equally use the command getc, but if one does so, all the postregisters are cleared. oper, getc, su, 1 oper, getc, sv, 2 oper, getc, sw, 3 !Postregisters 1 to 3 are devoted to stored velocity components (in this example). We !then use postregisters 4 to 6 to store the sum of the different iterations. oper, copy, 1, 4 oper, copy, 2, 5 oper, copy, 3, 6 !Here we begin the loop for reading the remaining of iterations *define, noexe *set, increm, 2, 2 store, iter, increm oper, getc, su, 1 oper, getc, sv, 2 oper, getc, sw, 3 oper, add, 1, 4, 4 oper, add, 2, 5, 5 oper, add, 3, 6, 6 *end *loop, 1, 107, 1 !In our example the number of time steps stored were 107 oper, sdiv, 107, 4, 4 oper, sdiv, 107, 5, 5 oper, sdiv, 107, 6, 6 oper, inverse, 4, 4 oper, inverse, 5, 5 oper, inverse, 6, 6

 May 8, 2004, 23:26 Re: time-averaging transient results #3 azmir Guest   Posts: n/a Thank you very much for your prompt response. I really needed something like this urgently. I will modify this macro and inform you of my progress. I suppose the end-product of this macro is one post file? Can I save it with a different name?

 May 15, 2004, 15:03 Re: time-averaging transient results #4 steve Guest   Posts: n/a It may be possible to activate the les averaging option (*.lesc files) for your case. I know you can do this with DES in 315. I am not sure of the exact process, but I would say Copy your old problem file Turn on the les model with averaging and write the problem file (you may get some warnings regarding discretisation etc.). Check the differences, I suspect one of them will be the flag to activate averaging. You will have to make a edit by hand of the problem file for every case you want to do averaging on. Try these settings on a small model. It is worth a try. Steve

 May 18, 2004, 01:34 Re: time-averaging transient results #5 azmir Guest   Posts: n/a Interesting! Will try! At the moment too much work too little time... Thanks for the idea!

 May 25, 2004, 09:09 Re: time-averaging transient results #6 yacine Guest   Posts: n/a you can do the avereging in the postdat soubroutine and compute any variable you want!

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