{"id":370496,"date":"2024-07-04T13:26:24","date_gmt":"2024-07-04T13:26:24","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/cfx-error\/"},"modified":"2024-07-04T13:26:24","modified_gmt":"2024-07-04T13:26:24","slug":"cfx-error","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/cfx-error\/","title":{"rendered":"CFX error"},"content":{"rendered":"

Hi all,<\/p>\n

I am getting an error when running a transient simulation which is as follows: <\/p>\n

——————————————————————-+
 | ERROR #004100018 has occurred in subroutine FINMES.                |
 | Message:                                                           |
 | Fatal overflow in linear solver. <\/p>\n

The 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? <\/p>\n

 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|
 +———————-+——+———+———+——————<\/p>\n

<\/p>\n

Many thanks<\/p>\n","protected":false},"template":"","class_list":["post-370496","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t