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-   -   Interogating Solution Values at Past Time Steps (https://www.cfd-online.com/Forums/fluent/30090-interogating-solution-values-past-time-steps.html)

 Rupp Carriveau July 29, 2002 16:58

Interogating Solution Values at Past Time Steps

I think I understand that Fluent can report "monitored" forces or field values on surfaces throughout time dependent calculations. However, I wondered if I can actually recover the entire solution (vector fields, etc.) for previous time steps in the series. I am trying to see how a flow evolves temporally. Say I solve it to the t=30s mark, could I actually go back to see what the vector field was at t=26s mark? Or do I have to solve my flow for t=26s, then t=27s, ..... , to t=30s?

Many thanks for any input!

Rupp.

 Lanre July 31, 2002 02:07

Re: Interogating Solution Values at Past Time Step

You have access to data from the last couple of time steps (See UDF Users Guide, FLUENT 6, Feb 2002). Anything beyond that and you'll have to write your data to a file. You could also use user-defined scalars to store variable fields, e.g., store three components of velocity with three UDS's. Use a UDF to execute the transfer of data to a UDS(e.g., C_UDSI(c,t,i) = C_U(c,t), etc.) at a specific time-step or count.

 Rupp Carriveau July 31, 2002 09:20

Re: Interogating Solution Values at Past Time Step

Thank You very much for the help.

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