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December 12, 2012, 05:56 |
Does Anybody knows what is it?
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#1 |
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Does Anybody knows what is it?
Its Fluents calculation. Jey engines nozzle. 2d axisymmetric model double precision density based k-e SST there are pessure distribution vibrations What is the error? |
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December 12, 2012, 12:44 |
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#3 |
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December 12, 2012, 13:01 |
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#4 |
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December 13, 2012, 02:38 |
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#5 |
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could it be because of limiter type?
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December 15, 2012, 02:10 |
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#6 |
Super Moderator
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How did you model the bypass and core flow?
Will they form the one stream when exiting the domain? Do you have convergent nozzle after the bypass and core flow? How did you specify the boundary conditions for the core flow and bypass flow? What is the boundary condition at the outlet of the domain? Mesh information : mesh type, no of nodes and refinement in the critical areas? Convergence criteria? Turbulence model? Approximation in geometry? How did you model the mixing? Please post few pics with mesh, domain etc to clearly see the problem area and then appropriate solution!!! |
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December 15, 2012, 07:02 |
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#7 |
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Boundary conditions in Bypass and Core channels where Pressure Inlet ( Total Pressure and Total temperature)
in the outlet of the domain - pressure outlet (static pressure) convergence criteria - all forces on the nozzle are constant and global disbalances Turbulence model - k-omega-SST What do u means about aproximations in geometry? Mesh - hexa |
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December 15, 2012, 08:41 |
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#8 |
Super Moderator
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It is mixed type turbofan engine?
I am assuming you have three streams. First one is freestream, second one is bypass and below one is the core flow. Right? Are they going to mix first and then exit from the propelling nozzle? PS: I have done the mixed flow turbofan simulation successfully in past |
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December 15, 2012, 08:43 |
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#9 | |
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Quote:
two streams - core and fan and external flow with Mach number 0.8 |
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December 15, 2012, 08:53 |
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#10 |
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Normal result of calculation - shock waves in fan stream without ripples near shock waves
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December 16, 2012, 11:56 |
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#11 |
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No one knows)
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December 16, 2012, 21:13 |
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December 17, 2012, 22:54 |
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