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pressure can be varied at different timestep ?

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Old   July 18, 2007, 08:39
Default pressure can be varied at different timestep ?
  #1
SKARP
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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 ?
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Old   July 18, 2007, 12:51
Default Re: pressure can be varied at different timestep ?
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Omer
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Yes it is possible. If you have a function with respect to time, you can use the Expressions tab for this purpose.
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Old   July 19, 2007, 00:14
Default Re: pressure can be varied at different timestep ?
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SKARP
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Can u pls tell me the expression.I badly in need of it.
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Old   July 19, 2007, 09:41
Default Re: pressure can be varied at different timestep ?
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Robin
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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
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Old   July 20, 2007, 02:02
Default Re: pressure can be varied at different timestep ?
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SKARP
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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.
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Old   July 20, 2007, 15:39
Default Re: pressure can be varied at different timestep ?
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Robin
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Read the doc on 1D profiles. It should be fairly obvious how to do this.
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