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-   -   how to check absolute velocity values (http://www.cfd-online.com/Forums/fluent/33730-how-check-absolute-velocity-values.html)

gaurav May 14, 2004 17:20

how to check absolute velocity values
 
Hi,

I am intrested in checking the absolute velocity values (or other parameters of interest) for each/different iteration . Can anybody help me , how to get these absolute velocity values for two successive iterations in fluent? Can we save these values before convergence/divergence is achieved.

Thanks in advance for the solution !!!

Regards Gaurav

Ajay May 16, 2004 15:42

Re: how to check absolute velocity values
 
You need to write a UDF for this using the DEFINE EXECUTE_AT_END where in you could write the values into a file. -Ajay

gaurav May 16, 2004 17:12

Re: how to check absolute velocity values
 
Hi, Thanks for the response Ajay. But I don not have experience/idea how to write that udf. Can U help me with that or tell me how to write it.

Regards, Gaurav

Prasad Dudhgaonkar May 17, 2004 05:24

Re: how to check absolute velocity values
 
Dear Gaurav

Another way can be as follows. 1) Draw a line/plane using surface menu. Go to XY plot and write values of velocity (or any property of interest) to a file. 2) Set number of iterations to 1 and iterate. 3) write values of velocity to another file.

You can compare these by using XY plot in Fluent. You can alo process the data in MS Excel or any other numerical processing program.

Hope this addresses your requirement.

Regards Prasad

gaurav May 17, 2004 13:38

Re: how to check absolute velocity values
 
thanks Prasad for the response.yea this can be one way of doing it.But i wanted to know if i can print velocity value or any other varaible of interest on fluent command window along with the residual values for each iteration.. Do u know about it if i can set it somehow in fluent ?

Regards-Gaurav

Prasad Dudhgaonkar May 17, 2004 16:38

Re: how to check absolute velocity values
 
Hi Gaurav,

You may try this. 1) Go to "Solve - Animate - Define - Display Type XY Plot". Select appropriate directory. 2) Choose surface (preferably a line) and property of interest on Y-axis. 3) You will have display of the plot which will be refreshed after every iteration. This frequency is to be set in Animation dialogue box.

Regards Prasad

gaurav May 17, 2004 17:04

Re: how to check absolute velocity values
 
Thanks once again Prasad. I will try this and see how it works. It seems i have found the solution :)

Regards-Gaurav

Prasad Dudhgaonkar May 17, 2004 17:07

Re: how to check absolute velocity values
 
Please try and let all others know how it worked out.:) Regards Prasad


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