# How to define a dynamic Boundary Condition? (New)

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 March 9, 2009, 07:44 How to define a dynamic Boundary Condition? (New) #1 abrahamgx Guest   Posts: n/a Recently I am dealing with a 2 stages compressor. I want to vary the outlet static pressure (writeen as Ps) according to the timesteps (writeen as t). And I am going to use a function such as: Ps=P1       (t<t1); Ps=0.01*t  (t1<t<t2); Ps=P2       (t>t2); The P1,P2,t1 and t2 are specified. So, could someone tell me that how to define the boundary condition in such a problem, should I use Fortran?

 March 9, 2009, 08:35 Re: How to define a dynamic Boundary Condition? (N #2 Adam Stuchlik Guest   Posts: n/a You can create a function in CFX-Pre which can be timestep dependend, like pressure(ctstep). Then donīt describe your boundary with a pressure value but with this function as an expression.

 March 9, 2009, 08:43 Re: How to define a dynamic Boundary Condition? (N #3 abrahamgx Guest   Posts: n/a Thank you Adam!

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