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Help to create a CEL Expression

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Old   December 3, 2007, 07:04
Default Help to create a CEL Expression
  #1
Juan Maria Campos
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Hi everybody,

I am new using CFX and i need a simple CEL Expression to control the pressure in a autoclave. I have a Pressure sensor in the middle of the clave and i need to control the mass flow inlet to control this pressure.

How can I write a CEL Expression that open / close the inlet boundary of air to maintain the pressure?

thanks im advance,

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Old   December 3, 2007, 08:49
Default Re: Help to create a CEL Expression
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macdidi@caramail.com
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Hello Lets say that youre mass flow value is mf and youre pressure level is Pmax you have to write these expression in CEL: mf*step((P-Pmax)/1[Pa]) thes expression will equal to mf if P<Pmax and 0 if P>=Pmax
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Old   December 3, 2007, 08:52
Default Re: Help to create a CEL Expression
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Juan Maria Campos
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Thank you!; I was jus reading about the step function on CFX-Help
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