Reversed flow on 28 faces of pressure-outlet 7.
Stabilizing mp-x-momentum to enhance linear solver robustness.
Stabilizing mp-x-momentum using GMRES to enhance linear solver robustness.
Stabilizing mp-y-momentum to enhance linear solver robustness.
Stabilizing mp-y-momentum using GMRES to enhance linear solver robustness.
Stabilizing k to enhance linear solver robustness.
Stabilizing k using GMRES to enhance linear solver robustness.
Divergence detected in AMG solver: k Stabilizing epsilon to enhance linear solver robustness.
Stabilizing epsilon using GMRES to enhance linear solver robustness.
Divergence detected in AMG solver: epsilon Stabilizing flue-gas-species-0 to enhance linear solver robustness.
Stabilizing flue-gas-species-1 to enhance linear solver robustness.
Stabilizing temperature to enhance linear solver robustness.
Stabilizing temperature using GMRES to enhance linear solver robustness.
Stabilizing vof-1 to enhance linear solver robustness.
absolute pressure limited to 5.000000e+10 in 2708 cells on zone 4
turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 7089 cells
Divergence detected in AMG solver: k
Divergence detected in AMG solver: epsilon
Divergence detected in AMG solver: k
Divergence detected in AMG solver: epsilon
Divergence detected in AMG solver: k
Divergence detected in AMG solver: epsilon
Divergence detected in AMG solver: k
Divergence detected in AMG solver: epsilon
Divergence detected in AMG solver: k
Divergence detected in AMG solver: epsilon
Divergence detected in AMG solver: k
Divergence detected in AMG solver: epsilon
Divergence detected in AMG solver: k
Divergence detected in AMG solver: epsilon
Divergence detected in AMG solver: k
Divergence detected in AMG solver: epsilon
Divergence detected in AMG solver: k
Divergence detected in AMG solver: epsilon
Divergence detected in AMG solver: k
Divergence detected in AMG solver: epsilon
Divergence detected in AMG solver: k
Divergence detected in AMG solver: epsilon
Error at host: floating point exception
===============Message from the Cortex Process================================
Compute processes interrupted. Processing can be resumed.
==============================================================================
Error at Node 2: floating point exception
Error at Node 5: floating point exception
Error at Node 3: floating point exception
Error at Node 9: floating point exception
Error at Node 1: floating point exception
Error at Node 4: floating point exception
Error at Node 7: floating point exception
Error at Node 11: floating point exception
Error at Node 0: floating point exception
Error at Node 6: floating point exception
Error at Node 8: floating point exception
Error at Node 10: floating point exception
Hello Darlington,
I would have some suggestions to try:
1) Check the mesh quality (Orthogonality). If it has a bad quality, try to improve it. Meanwhile, try a finer mesh with a smaller time step size.
2) I will recommend checking the value for the SSE (Standard State Enthalpy) of materials.
Hello,
I think this is a common question of all CFD engineers.
The messages you saw show a signal of "Divergence!". Why? Let me point out several possible reasons:
- Mesh: This is the most basic mistake of beginners
- Boundary conditions: Wrong or inappropriate settings. e.g. back flow with a strange temperature value. For the reactions kinetics, it is better to test them in Excel or MALAB first. Check the unit of values.
- Model settings: Most of solutions can be found here. It is better to read more papers, tutorials, and books. You need to find the suitable set of numerical methods to minimize the errors. Since errors may come from various sources, you need to trial all of them. Several problems cannot be solved by the steady state solver.
- Physical properties: At the beginning, you try to use constants. Do not mix constants and polynomials. When your system becomes more stable, you can try to turn it back to temperature dependent.
- Initial conditions: Check carefully your initial conditions. Use the interpolate file if necessary.
- Time step size: Do not reduce the under relaxation factors, reduce the time step size instead.
- Bugs of UDF: Some NaN values or divide-by-zero errors
- Simplification: Do not solve directly a complex problem. Solve a simpler one. Then you can increase the complexity.
- Badges
- Science topic
- Similar topics
- Geoscience
- Atmospheric Sciences
- Climate Science
- Climate Change