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Problem to solve T8 cascade test

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Old   October 16, 2017, 14:19
Question Problem to solve T8 cascade test
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Ana Adalgiza
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Hello, I'm trying simulate a T8 cascade test in Fluent, but the shock wave is dissipating in fluid who causes the maximum Mach number lower than expected.

The boundary conditions who i used are:
-Inviscid flow;
-Energy is on;
-Steady state;
-Pressure inlet: 43.842 Pa;
-Temperature: 292 K;
-Pressure outlet: 23.080 Pa;
-Periodicity in the blade channel;
-Operating Conditions: 0 Pa.

In the solver i used density-based, in the solution method i tried to use implicit-AUSM. The spatial discretization in gradient is setted as Least squares cell based. Initially, i run calculation to the flow as first order upwind and when the solution is converged i changed that to the second order.

The mesh was checked and the quality is ok! I used the same mesh and case to an in-house program (this program is validated) and i obtained a good resolution of shock wave.
Can someone help me?

Thanks everyone,

Ana
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Old   October 17, 2017, 03:46
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Jaesan Yoon
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picture might be help to figure out problem.

did you use same mesh for the two solvers?

how about adapt mesh near shockwave
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Old   October 19, 2017, 21:36
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Ana Adalgiza
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I'm working as a Turbine. I used the same mesh in both solver. I did not try to use the adaptative mesh.

In picture shown what is happening.
Attached Images
File Type: png case_t8.png (24.3 KB, 2 views)
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