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-   -   Inlet velocity as a function of time. Transient analysis. (http://www.cfd-online.com/Forums/cfx/110434-inlet-velocity-function-time-transient-analysis.html)

 Elgaard December 11, 2012 08:58

Inlet velocity as a function of time. Transient analysis.

Hello,

Does anybody know if it is possible to setup an inlet boundary with userdefined velocity as a function of time.

What i would like to do is set the velocity to 0m/s for 0->1s and then 10m/s for 1->10s.

Is it possible to set up a table, or in any other way define the velocity in a more advanced way?

/Elgaard

 Lance December 11, 2012 09:01

Your example can easily be solved using an expression with step functions. For more advanced profiles see http://www.edr.no/blogg/ansys_blogge...nsient_profile (or search this forum...)

 Elgaard December 11, 2012 10:03

Thank you. I am quite new to CFX, but this helped a lot. Found a manual for the CEL language, and got it to work.

Manual: http://hikwww2.fzk.de/hik/orga/hlr/A...xpres_lang.pdf

Expression: step(t*1[s^-1]-1)*10[m s^-1]

/Elgaard

 Lance December 12, 2012 03:36

The manuals come with the installation, usually located at:
C:\Program Files\ANSYS Inc\v140\commonfiles\help\en-us\pdf
or by pressing F1 inside CFX.

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