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September 10, 2022, 20:15 |
Supersonic Ramp Simulation
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#1 |
New Member
Gurjot Ahuja
Join Date: Jun 2022
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Hello All,
I am a beginner in Ansys CFX. I have to simulate a supersonic flow Ma=3.2, Air Ideal Gas, 850K for laminar conditions, frictionless walls to analyze shock waves and expansion fans. As per the theory, I have to set 5 independent variables as inlet conditions. So, I can set Total Temperature, 3 x Velocities directly from the given conditions and I am deriving Total Pressure for Inlet from Isentropic Relations and Ideal Gas Law. Is my approach correct to find the total pressure with is coming around 48.5 bar? For Outlet, I am setting supersonic flow conditions in CFX Pre When I am using Total Pressure as 48.5bar, my simulation is not converging at all. Please help to resolve these issues. Kind Regards. |
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September 10, 2022, 22:47 |
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#2 |
Super Moderator
Glenn Horrocks
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Location: Sydney, Australia
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Please read the section titled "Using Boundary Condition" (section 2.3 of the Solver Modelling guide) and "Monitoring and Obtaining Convergence" (section 16.10 of the Solver Modelling Guide).
Make sure the basics are OK before we go too far.
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September 11, 2022, 13:46 |
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#3 |
Senior Member
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If you look at your options for supersonic inlets, you have
1 - Velocity and Total Pressure 2 - Velocity and Static Pressure 3 - Static and Total Pressure There is no need to convert anything, nor use any relationships. Have you tried say M= 1.5, then 2.0, 2.5, 3.0 ? What is the solution for those intermediate flows? What did I miss?
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September 11, 2022, 14:56 |
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#4 |
New Member
Gurjot Ahuja
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Thanks for the reply. I will check the documentation.
Last edited by tum-student; September 11, 2022 at 15:10. Reason: Update |
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September 11, 2022, 15:01 |
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#5 | |
New Member
Gurjot Ahuja
Join Date: Jun 2022
Posts: 5
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Quote:
My requirement is to do laminar and turbulent simulation only for M 3.2, so I haven't tried other Mach numbers. First, I am trying to set up a laminar simulation. |
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September 11, 2022, 18:29 |
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#6 | |
Senior Member
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Quote:
Regardless of requirements, you must always follow common sense and understand one step at a time. Good luck with your simulations.
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Tags |
ansys, cfx, ramp, supersonic |
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