# pressure can be varied at different timestep ?

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 July 18, 2007, 08:39 pressure can be varied at different timestep ? #1 SKARP Guest   Posts: n/a Hi, I want to vary the pressure from 0-5 bar at the inlet by the time interval of 0-5 sec. How this can be possible ?

 July 18, 2007, 12:51 Re: pressure can be varied at different timestep ? #2 Omer Guest   Posts: n/a Yes it is possible. If you have a function with respect to time, you can use the Expressions tab for this purpose.

 July 19, 2007, 00:14 Re: pressure can be varied at different timestep ? #3 SKARP Guest   Posts: n/a Can u pls tell me the expression.I badly in need of it.

 July 19, 2007, 09:41 Re: pressure can be varied at different timestep ? #4 Robin Guest   Posts: n/a Create a 1D function in Pre, say you call it myPressure. Enter coordinate units of [s] ) and result units of [Pa]. Enter coordinates and results for 0 [s], 0 [Pa] and 5 [s], 5 [Pa]. Turn on extend min and extend max. To use the function, enter the following expression in your boundary condition for pressure: myPressure(t) That's it. Regards, Robin

 July 20, 2007, 02:02 Re: pressure can be varied at different timestep ? #5 SKARP Guest   Posts: n/a Hi Robin, Thanks a lot,I am not able to understand clearly Can u pls give it in expression format. That would be helpful to do my project successfully I want to vary the pressure from 0-5 bar during the time intervel of 0-10 sec at inlet. For every 2s the pressure should be varied. Can u give it in expression format pls.

 July 20, 2007, 15:39 Re: pressure can be varied at different timestep ? #6 Robin Guest   Posts: n/a Read the doc on 1D profiles. It should be fairly obvious how to do this.

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