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April 4, 2005, 03:18 |
About divergence for help!
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#1 |
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Hello,everyone!
Now I have a problem about divergence. When I do caculation of one case,it will divergence when I do it as tuebulent flow,while when I do it as laminar flow,it will not divergence. The printfile on screen it as follows: *** GEOMETRICAL CALCULATIONS STARTED *** GEOMETRICAL CALCULATIONS COMPLETED |----------------------------------------| | STAR VERSION 3.150 | | THERMOFLUIDS ANALYSIS CODE | | Run on hardware: Linux | | Stardate: 4-APR-2005 Time is 10:41:44 | |----------------------------------------| |-----------------------------------------------------------| | STAR Copyright (C) 1988-2001, Computational Dynamics Ltd. | | Proprietary data --- Unauthorized use, distribution, | | or duplication is prohibited. All rights reserved. | |-----------------------------------------------------------| |-------------------------------------------------------------------------------------------| | ---------------------------- PROBLEM SPECIFICATION SUMMARY ---------------------------- | |-------------------------------------------------------------------------------------------| | CASE TITLE .................. => | | NUMBER OF CELLS ............. => 242512 | | NUMBER OF BOUNDARY FACES .... => 39301 | | MESH DIMENSIONS XMIN XMAX YMIN YMAX ZMIN ZMAX | | (IN METRES) ............ => 0.0E+00 1.3E+00 0.0E+00 8.9E-01 0.0E+00 2.1E+00 | | RESTART DATA ................ => WILL BE SAVED ON FILE.pst | | SURFACE DATA ................ => WILL NOT BE SAVED | | BOUNDARY DATA ............... => WILL NOT BE PRINTED | | CONVERGENCE DATA ............ => WILL NOT BE PRINTED | | FIELD DATA .................. => WILL NOT BE PRINTED | | STEADY FLOW ................. => START FROM ITERATION = 0 | | INITIALISATION .............. => WILL BE EMPLOYED | | DATA DUMP (FILE.pst)......... => EVERY 10 ITERATIONS | | SOLUTION PROCEDURE .......... => SIMPLE | | RESIDUAL TOLERANCE .......... => 1.00E-03 | | MAX. NO. OF ITERATIONS ...... => 100 | | NO. OF FLUID MATERIALS ...... => 1 | |-------------------------------------------------------------------------------------------| |-> FLUID 1 -------------------------------------------------------------------| |-------------------------------------------------------------------------------------------| | SOLVE ....................... => U, V, W, P, TE, ED,VIS, | | FLUID FLOW .................. => TURBULENT INCOMPRESSIBLE HIGH RE K-EPS MODEL | | CHARACTERISTIC LENGTH ....... => 1.000E+00 m | | MONITORING LOCATION ......... => 146468 | | REFERENCE PRESSURE .......... => PREF = 1.000E+05 Pa | | MOLECULAR VISCOSITY ......... => CONSTANT - MU = 1.810E-05 Pas | | DENSITY ..................... => CONSTANT - RHO = 1.205E+00 kg/m3 | | FIXED FLOW BOUNDARY FLUXES... => FVIN = 0.000E+00 kg/s FVOUT = 1.929E-01 kg/s | | => FLOUT = 0.000E+00 kg/s | |-------------------------------------------------------------------------------------------| |-> BOUNDARY TYPES USED -------------------------------------------------------------------| |-------------------------------------------------------------------------------------------| | INLET, WALL, PRESSURE, | | Turbulence intensity and Mixing length specified at inlets | | Turbulence intensity and Mixing length specified at pressure boundaries | |-------------------------------------------------------------------------------------------| |-> SOLUTION PARAMETERS -------------------------------------------------------------------| |-------------------------------------------------------------------------------------------| | VARIABLE | U V W P TE ED | |-------------------------------------------------------------------------------------------| | RELA. FAC. | 7.000E-01 7.000E-01 7.000E-01 3.000E-01 7.000E-01 7.000E-01 | | DIFF. SCH. | UD UD UD - UD UD | | DSCH. FAC. | 0.000E+00 0.000E+00 0.000E+00 - 0.000E+00 0.000E+00 | | SOLV. TOL. | 1.000E-01 1.000E-01 1.000E-01 5.000E-02 1.000E-01 1.000E-01 | | SWEEP LIM. | 100 100 100 1000 100 100 | |-------------------------------------------------------------------------------------------| | VARIABLE | T DENS TVIS MVIS CP COND | |-------------------------------------------------------------------------------------------| | RELA. FAC. | 9.500E-01 1.000E+00 1.000E+00 1.000E+00 1.000E+00 1.000E+00 | | DIFF. SCH. | UD CD - | | DSCH. FAC. | 0.000E+00 1.000E-02 - - - - | | SOLV. TOL. | 1.000E-01 - - - - - | | SWEEP LIM. | 100 - - - - - | |-------------------------------------------------------------------------------------------| | * RESIDUAL NORMALISATION PRACTICE REPRESENTATIVE OF VARIABLE FLUX USED | | * NORMALISATION FACTORS WILL BE DYNAMICALLY UPDATED AS THE FLOW DEVELOPS | |-------------------------------------------------------------------------------------------| |------------------------------------| I---------------------------------------------| CALCULATION MONITORING INFORMATION |---------------------------------------------I |------------------------------------| ITER I---------------- GLOBAL ABSOLUTE RESIDUAL ----------------I I----------- FIELD VALUES AT MONITORING LOCATION -------I NO UMOM VMOM WMOM MASS T EN DISS ENTH U V W P TE ED T 1 3.83E-02 3.05E-02 1.04E-02 1.00E+00 9.45E-02 NaN 0.00E+00 -8.49E-02 1.22E-01-4.91E-03-1.33E-01 7.40E-04 2.10E-07 2.00E+01 &&&& -------------------------------------------------------------- -------------------------------------------------------------- *** SOLUTION DIVERGES/UNSTABLE. *** CALCULATIONS TERMINATED; NEW FILE.div WRITTEN STAR-CD Version 3.150 Computational Dynamics, Ltd. END OF EXECUTION - STAR CPU TIME IS 47.77 ELAPSED TIME IS 147.71 __________________________________________________ _____ I am waiting for hopes!! Thank you very much! |
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