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help on expressions in free surface(tutorial flow over a bump)

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Old   May 14, 2009, 00:49
Question help on expressions in free surface(tutorial flow over a bump)
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hi
is there any one how can help me understand the mean of expression in that tutorial (flow over bump)
for example what is
DownH=0.022 [m]

and so
UpH =0.069

and i don understand what stem function does in
the following expression

step((y-UpH)/1[m])
and
DenH*g*UpVFWater*(UpH-y)

???!!!
is there any tutorial on how to define expression in advance?

any help would deeply apreciated
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Old   May 14, 2009, 04:39
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http://www.cfd-online.com/Forums/cfx...tml#post216038

Quote:
is there any tutorial on how to define expression in advance?
Many tutorials involve expressions. What tutorials have you already done???? My personal advice is to do them ALL before attempting to do anything yourself.

step(x)= 0 if x<0 ; = 0.5 if x=0 ; = 1 if x>0 ...(x can be any expression, but has to be dimensionless). This is covered in the documentation and in some of the tutorials.
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