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CEL Position Dependent Variables in CFX-Pre

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Old   November 19, 2011, 11:33
Post CEL Position Dependent Variables in CFX-Pre
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njw
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Neal Wannell
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Hi there,
I am trying to model the evaporation of water from a surface. I am modelling the liuid surface as a free-slip wall and am using a continuity source over the wall to represent the evaporated water.

I am writing expressions to calculate this mass flux, and they require the wall heat flux for the boundary in question. The wall is an x-y plane and I need to have a heat flux that is dependent on the x and z coordinate over the wall surface. I only know how to use locator based functions that calculate an average of the variable over the surface, and this is not suitable.

How would I go about writing a CEL expression to include this position dependence over the wall?

Thanks
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Old   November 19, 2011, 19:16
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sajad
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hi
there is a command in name of "position x" or "position y" and so "position z"...are this helpful for you?

can you say what is your problem and whiat is the CEL too?
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Old   November 20, 2011, 06:11
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Glenn Horrocks
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You can use x, y and z variables in the CEL expression to define the boundary condition. For instance in the boundary condition definition "heat flux = 10*x +100*y - 5*z" would give you a varying heat flux over the boundary surface.
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