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Residuals high for 2D Convergent divergent nozzle simulation |
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November 11, 2014, 09:12 |
Residuals high for 2D Convergent divergent nozzle simulation
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Xiaosheng Chen
Join Date: Sep 2013
Posts: 2
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Hello, I met problems when simulating a 2D axisymmetric convergent-divergent nozzle using density-based solver in Fluent.
I calculated my inlet and outlet boundary conditions following the 1D analysis of gas dynamics, for throat Mach number 1 and 0.7 respectively. Specified four types of boundary for inlet and outlet: 1. Velocity inlet & Pressure outlet 2. Pressure inlet & outlet 2. Pressure-far-field for inlet & outlet 3. Mass flow inlet & outlet And I also tried to lower the Courant number to 0.1. However, all simulations result in a very high residual level. The x-velocity residuals are as high as 50. I'd appreciate it if anyone can give me some help. |
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