CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   CFX (http://www.cfd-online.com/Forums/cfx/)
-   -   How to access a parameter from a previous timestep (http://www.cfd-online.com/Forums/cfx/77098-how-access-parameter-previous-timestep.html)

Ridley June 13, 2010 04:31

How to access a parameter from a previous timestep
 
Hi, I have a problem with a CEL-expression, where the density from the previous timestep (transient simulation) is needed for the calculation. Is it possible to access the density from this previous timestep just by using CEL-Code?

Thanks a lot!

Attesz June 13, 2010 10:29

hi, you have to use density(current time step -1)@somewhere. search for the syntax code of the current time step (for example, current iteration number is "citern"). i don't know surely, but it should work.

ghorrocks June 14, 2010 18:40

Sorry, but the answer is no. It is not possible. This is the biggest failing in CFX CEL. You may be able to use an additional variable and make use of the fact the CEL is updated at the start of a time step and additional variables at the end - but I have not confirmed this works.

Attesz June 15, 2010 03:06

I used it by adjusting the RPM's, outlet pressures etc. But as I see, for the flow parameters it is not suitable. It's really a big fail...

ghorrocks June 15, 2010 06:55

What is an RPM?

Attesz June 15, 2010 06:56

Sorry, Revolutions Per Minute :)


All times are GMT -4. The time now is 10:20.