[payam.t]

Hi to everyone
I want to build a expression in CFX that sets static pressure equal to 5MPa, where -1<x<1,-1<y<1 (x , y are location of domain in x,y direction in meter).
Any ideas welcome.
After building this expression, how I can use it in numerical solution as an initial value?

[ghorrocks]

You could do this using interpolation functions, but I would use an expression for this as it is easy and allows you to parameterise things easily. A function something like this should do it:

output = 5 [MPa] * step(1-abs(x)/1[m]) * step(1-abs(y)/1[m])

Simply use this as the definition for an initial condition.

[payam.t]

Originally Posted by ghorrocks

You could do this using interpolation functions, but I would use an expression for this as it is easy and allows you to parameterise things easily. A function something like this should do it:

output = 5 [MPa] * step(1-abs(x)/1[m]) * step(1-abs(y)/1[m])

Simply use this as the definition for an initial condition.

I am sorry to ask again...
Can you explain me how can I do this by interpolation function?

[ghorrocks]

Look in the documentation or tutorials for tips on using interpolation functions.