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December 4, 2012, 03:38 |
fluent internal nozzle flow
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#1 |
New Member
matt
Join Date: Oct 2012
Posts: 9
Rep Power: 13 |
Hello, I need help setting up the physics for this problem in fluent.
I have a 15 degree conic nozzle which I have created the geometry, and meshed (see attached) and named edges for the inlet and outlet. Total Pressure = 2.5 MPa Total Temperature = 2500K exit mach should be 3.0 here is what I used: Physics-setup General Density-Based Solver : selected because was originally designed for high-speed compressible flows. Time: Steady 2D Space: Planar Models energy equation: on energy equation is coupled to the continuity and momentum equations Viscous model: inviscid Materials Air - Set density to ideal gas Cell Zone Conditions Surface_Body Operating pressure set to 0 Pa Boundary Conditions inlet: type pressure-inlet, Gauge total pressure:2500000 Pascal, Gauge Total Temperature 2500 K constant outlet: type pressure-outlet, Gauge total pressure: 0 Pa, 300K Solution Methods Formulation:Implicit ,Flux type: Roe-FDS Spatial Discretization: Least squares cell based flow Second order upwind So... I ran calculation with solution steering, 1000 iterations, flow type supersonic, use fmg initialization and well it does not look as I had expected. what should I do instead so that I have mach=1 at the inlet, and so that it expands to mach 3 at the exit. the geometry was determined by method of characteristics to do this with the input data. geometry.jpg mesh.jpg velmag.jpg |
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