I need to simulate a flow in a hypersonic wind tunnel, using CFD(Fluent). But I'm having problems setting up the boundary conditions to simulate the flow. People who can help me please do reply.
Thank you in advance.
First you carefully design the geometry of the wind tunnel in any design modeler or using GAMBIT. Import the geometry into Fluent. Define required boundary conditions at the inlet, outlet and walls. For Specifying special boundary conditions use USER DEFINED FUNCTIONS. Refer UDF manual provided by ANSYS.
Inlet as Pressure far field
Wall as Pressure far field
Outlet as Pressure outlet
This is simple Boundary conditions to simulate the hypersonic flow and it will differ based on our specific objective of the project
It depends on your attention problem. If you're going to compare the shock configurations with the experimental results, you'd better:::
Inlet and Outlet as Pressure far field, and the pressure and temperature are given as the incoming value. The wall is better set as Symmetric boundary to avoid a shock/boundary interaction.
Otherwise, you can give a fix-temperature wall condition.
You'd better try it more times, then you will find the best setting.
Inlet, wall, Outlet should suffice.
types of boundary conditions.
Pressure far field boundary condition takes in flow velocity in term of Mach number and it is also recommended to be used in case if you intend to capture the shockwaves.
If capturing shocks is not the primary goal then any of the other boundary conditions can be used like velocity in, velocity out; mass in, mass out in ANSYS Fluent.
Give the following boundary conditions after generating your mesh
Inlet as Pressure Far Field
Wall as Wall/Symmetric wall
Outlet as Pressure outlet/Pressure FarField
Apart from boundary conditions, consider the initial conditions and governing equations "Physics".
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