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July 4, 2024 at 1:26 pm
Stephen Orritt
SubscriberHi all,
I am getting an error when running a transient simulation which is as follows:Â
-------------------------------------------------------------------+
 | ERROR #004100018 has occurred in subroutine FINMES.         |
 | Message:                              |
 | Fatal overflow in linear solver.ÂThe simulation is modelling a wind turbine using a momentum source, the simulations run well and seem to agree with literature data when run as a steady-state frozen rotor simulation (image below). However, when switching over to a transient simulation I get the error stated at the first timestep. Can momentum sinks be used for rotating transient simulations? I have looked at the documentation which does not point to anything obvious other than rechecking the physics and mesh. I believe the mesh is of suitable detail and quality for this initial simulation. I have also looked at changing the timestep down to E-5 seconds and that does not solve the issue. One thing I have noticed in the output file is the wallscale residual seems to fail initially, could this be the issue and how could I solve this?Â
 SOLVING : Wall Scale                        |
 ----------------------------------------------------------------------
 |    Equation    | Rate | RMS Res | Max Res |  Linear Solution |
 +----------------------+------+---------+---------+------------------+
 | Wallscale       | 0.00 | 2.4E-05 | 1.2E-03 |  9.6  2.8E+01  F |
 +----------------------+------+---------+---------+------------------+
 | Wallscale       |99.99 | 6.8E+13 | 1.2E+15 |  9.6  8.3E-02  OK|
 +----------------------+------+---------+---------+------------------Many thanks
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July 9, 2024 at 4:56 am
Bhargav Desai
Ansys EmployeeHi Stephen,
Generally this error is received when the boundary conditions are set incorrectly or if the initial values are inappropriate.
Since you are running a transient case, please make sure the interface definition are correct and the initial values you are using for simulation are reasonable.
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