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January 27, 2005, 16:38 |
Detailed Description
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#1 |
Guest
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Hello,
My Warnings are : *** WARNING #060 *** DENSITY OUT OF BOUND DUE TO PRESSURE CORRECTION AT CELL 509895 DENSITY= 1.2515E-03 LIMITER APPLIED GIVING UP AFTER PRINTING 50 #060 WARNINGS Total number of #060 warnings: 5820 AND *** WARNING #057 *** EQUATION OF STATE IMBALANCE AT CELL 509774 IS 1.710664E+00 EQUATION OF STATE IMBALANCE FOUND AT MORE THAN 100 CELLS - PRINTOUT OF WARNING MESSAGE STOPPED I want to give you more details of my simulation for you and others to better understand the problem and give me suggestions. My CASE: 1.Transient, Moving mesh (Rotor moving at 10300 rpm and stators stationary). 2 stagnation inlets and 2 pressure outlets as it is a 4 port configuration. 3. Molecular properties: Ideal f (T,P) , Constant default properties for Air in terms of Molecular viscocity, Cp, Conductivity and Molecular weight. 4. Turbulence Model - K-epsilon High Re Thermal Models - (conservation- static enthalpy, enthalpy- thermal) Initialization - Default Initialization flow with 0 max vel and atmosphere pressure and temp. 5 Monitoring and Reference cells at outlet with atmospheric pressure assigned. 6. Max number of corrector stages : 50 Reduction in Residual for corrector stages = 0.25 under relaxation for pressure correction = 0.01 scalar solver - method - CG Implicit Temporal Discretization Solving for U, V,W, Pres, Turb KE, Turb Diss, T . Differencing schemes - UD and MARS 7. Time step : 1.21 e -10 sec. run for 0.005825 secs Still I am getting these warnings at all time steps for almost all the cells i guess: *** WARNING #060 *** DENSITY OUT OF BOUND DUE TO PRESSURE CORRECTION AT CELL 509895 DENSITY= 1.2515E-03 LIMITER APPLIED GIVING UP AFTER PRINTING 50 #060 WARNINGS Total number of #060 warnings: 5820 AND *** WARNING #057 *** EQUATION OF STATE IMBALANCE AT CELL 509774 IS 1.710664E+00 EQUATION OF STATE IMBALANCE FOUND AT MORE THAN 100 CELLS - PRINTOUT OF WARNING MESSAGE STOPPED |
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January 27, 2005, 16:57 |
Re: Detailed Description
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#2 |
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Also I am getting this error sometimes when I use static conditions for inlet instead of stagnation:
After 1st Iteration: Calculation stopped due to negative densities in more than 100 cells.. Help me!!! Arnab |
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January 28, 2005, 07:15 |
Re: Detailed Description
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#3 |
Guest
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u can try by reducing the residual tolarances to avoid the negative density.
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