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-   -   Solver error message!!! (http://www.cfd-online.com/Forums/cfx/23021-solver-error-message.html)

IoSa September 4, 2006 08:30

Solver error message!!!
 
Hi,

I am running a free surface simulation on a wigley hull, I run the Solver and after 30 iterations it stops with an error. The simulation progresses quite well other than the exit error.

Does anyone have any suggestion?

Below is a part from the output file:

OUTER LOOP ITERATION = 31 CPU SECONDS = 9.03E+03 ---------------------------------------------------------------------- | Equation | Rate | RMS Res | Max Res | Linear Solution | +----------------------+------+---------+---------+------------------+ | U-Mom-Bulk | 0.99 | 4.6E-03 | 2.5E-01 | 3.7E-04 OK| | V-Mom-Bulk | 1.01 | 1.2E-04 | 4.0E-03 | 3.3E-02 OK| | W-Mom-Bulk | 0.98 | 2.0E-03 | 3.3E-02 | 5.5E-04 OK| | P-Vol | 0.98 | 1.7E-05 | 9.1E-04 | 9.1 6.0E-02 OK| +----------------------+------+---------+---------+------------------+ | Mass-Water at 25 C | 1.00 | 7.0E-02 | 9.8E-01 | 10.4 5.3E-17 OK| +----------------------+------+---------+---------+------------------+ | K-TurbKE-Bulk | 0.95 | 4.6E-03 | 1.7E-01 | 10.3 3.7E-08 OK| | E-Diss.K-Bulk | 0.96 | 2.8E-03 | 2.4E-01 | 11.1 5.0E-08 OK| +----------------------+------+---------+---------+------------------+

Execution terminating: STP file found.

CFD Solver finished: Fri Sep 1 18:05:46 2006

CFD Solver wall clock seconds: 9.4150E+03

================================================== ====================

Boundary Flow and Total Source Term Summary ================================================== ====================

+--------------------------------------------------------------------+ | U-Mom-Bulk | +--------------------------------------------------------------------+ Boundary : Bottom -5.6174E-13 Boundary : Inlet -7.9622E+03 Boundary : Outlet 5.2855E+03 Boundary : Side 1.4929E-10 Boundary : SymP 2.8713E-13 Boundary : Top -1.3899E+00 Boundary : Wigley -3.5061E-01 Domain : Domain 1 4.4405E-13

----------- Domain Imbalance : -2.6785E+03

Domain Imbalance, in %: -2.0517 %

+--------------------------------------------------------------------+ | V-Mom-Bulk | +--------------------------------------------------------------------+ Boundary : Bottom -1.4997E-12 Boundary : Inlet 7.7425E-04 Boundary : Outlet 7.6339E-05 Boundary : Side -6.5999E+04 Boundary : SymP 6.5990E+04 Boundary : Top 2.8523E-03 Boundary : Wigley 2.0232E+01 Domain : Domain 1 5.8358E-13

----------- Domain Imbalance : 1.1483E+01

Domain Imbalance, in %: 0.0088 %

+--------------------------------------------------------------------+ | W-Mom-Bulk | +--------------------------------------------------------------------+ Boundary : Bottom 1.3055E+05 Boundary : Inlet -1.2531E+00 Boundary : Outlet 1.9854E-01 Boundary : Side 3.9222E-09 Boundary : SymP 1.0983E-11 Boundary : Top -5.4099E+00 Boundary : Wigley -1.4407E+01 Domain : Domain 1 -1.2695E+05

----------- Domain Imbalance : 3.5782E+03

Domain Imbalance, in %: 2.7409 %

+--------------------------------------------------------------------+ | P-Vol | +--------------------------------------------------------------------+ Boundary : Inlet 1.2745E+03 Boundary : Outlet 8.4489E+02 Boundary : Top -2.6317E+00

----------- Domain Imbalance : 2.1167E+03

Domain Imbalance, in %: 166.0882 %

+--------------------------------------------------------------------+ | Mass-Water at 25 C | +--------------------------------------------------------------------+ Boundary : Inlet 1.2744E+03 Boundary : Outlet 8.2992E+02 Boundary : Top -4.3419E-08

----------- Domain Imbalance : 2.1043E+03

Domain Imbalance, in %: 165.1248 %

+--------------------------------------------------------------------+ | Locations of Maximum Residuals | +--------------------------------------------------------------------+ | Equation | Node # | X | Y | Z | +--------------------------------------------------------------------+ | U-Mom-Bulk | 165847 | 1.571E+00 | 7.477E-01 |-1.000E+00 | | V-Mom-Bulk | 262492 |-7.444E+00 | 4.968E-02 |-1.653E-02 | | W-Mom-Bulk | 184319 | 2.241E+00 | 8.647E-01 |-3.413E-01 | | P-Vol | 37511 |-1.050E+01 | 1.000E+00 |-3.413E-01 | | Mass-Water at 25 C | 309237 |-7.750E+00 | 6.463E-01 |-1.316E-19 | | K-TurbKE-Bulk | 409356 |-1.016E+01 | 1.000E+00 | 1.000E-03 | | E-Diss.K-Bulk | 409355 |-1.016E+01 | 8.647E-01 | 1.000E-03 | +--------------------------------------------------------------------+

+--------------------------------------------------------------------+ | Peak Values of Residuals | +--------------------------------------------------------------------+ | Equation | Loop # | Peak Residual | Final Residual | +--------------------------------------------------------------------+ | U-Mom-Bulk | 2 | 5.90756E-02 | 4.55770E-03 | | V-Mom-Bulk | 2 | 2.23065E-03 | 1.15537E-04 | | W-Mom-Bulk | 2 | 2.51213E-02 | 1.99012E-03 | | P-Vol | 1 | 1.27176E-03 | 1.69516E-05 | | Mass-Water at 25 C | 3 | 7.06398E-02 | 6.98146E-02 | | K-TurbKE-Bulk | 15 | 6.66195E-03 | 4.62582E-03 | | E-Diss.K-Bulk | 1 | 2.52183E-02 | 2.77412E-03 | +--------------------------------------------------------------------+

+--------------------------------------------------------------------+ | Variable Range Information | +--------------------------------------------------------------------+

Domain Name : Domain 1 +--------------------------------------------------------------------+ | Variable Name | min | max | +--------------------------------------------------------------------+ | Water at 25 C.Velocity u | -1.36E+00 | 1.69E+00 | | Water at 25 C.Velocity v | -2.14E-01 | 3.14E-01 | | Water at 25 C.Velocity w | -1.06E+00 | 2.62E+00 | | Pressure | -6.05E+01 | 1.21E+04 | | Water at 25 C.Conservative Volume Fraction | 1.00E-15 | 1.00E+00 | | Air at 25 C.Volume Fraction | 9.99E-16 | 1.00E+00 | | Water at 25 C.Volume Fraction | 1.00E-15 | 1.00E+00 | | Air at 25 C.Density | 1.18E+00 | 1.18E+00 | | Air at 25 C.Dynamic Viscosity | 1.83E-05 | 1.83E-05 | | Water at 25 C.Density | 9.97E+02 | 9.97E+02 | | Water at 25 C.Dynamic Viscosity | 8.90E-04 | 8.90E-04 | | Water at 25 C.Turbulence Kinetic Energy | 5.79E-05 | 1.56E-01 | | Water at 25 C.Turbulence Eddy Dissipation | 6.93E-05 | 1.05E+01 | | Air at 25 C.Eddy Viscosity | 1.45E-07 | 1.68E-03 | | Water at 25 C.Eddy Viscosity | 1.22E-04 | 1.42E+00 | | Eddy Viscosity | 1.54E-06 | 7.22E-01 | +--------------------------------------------------------------------+

+--------------------------------------------------------------------+ | CPU Requirements of Numerical Solution | +--------------------------------------------------------------------+

Subsystem Name Discretization Linear Solution

(secs. %total) (secs. %total) ---------------------------------------------------------------------- Momentum and Mass 5.38E+03 57.9 % 6.44E+02 6.9 % Volume Fractions 2.92E+02 3.1 % 2.29E+02 2.5 % TurbKE and Diss.K 9.12E+02 9.8 % 4.66E+02 5.0 %

-------- ------- -------- ------ Subsystem Summary 6.59E+03 70.9 % 1.34E+03 14.4 %

Variable Updates 6.11E+02 6.6 % Miscellaneous 7.59E+02 8.2 %

-------- Total 9.30E+03

+--------------------------------------------------------------------+ | An error has occurred in cfx5solve: | | | | The CFX-5 solver exited with return code 1. | +--------------------------------------------------------------------+

End of solution stage.

Fusion September 14, 2006 04:48

Re: Solver error message!!!
 
Your problem is in the P-Vol and Mass-Water imbalances (>100%), this cause unphysical flow behaviors. Check all your boundary conditions! You are using an Homogeneous Model in the Multiphase Options, try to switch to the Inhomogeneous one. Read and follow the Best Practice Guidelines for Multiphase Flow in the Manual. F


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