Warning 4725: It is highly recommended to use double precision accuracy (EG card).

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

I see the following warning:

Warning 4725: It is highly recommended to use double precision accuracy (EG card).


What does it mean and what should I do to fix it?

Tagged:

Answers

  • JIF
    JIF
    Altair Employee
    edited June 2017

    This warning can be given together with 'WARNING 563: The MoM matrix is numerically singular, solution very critical.'

    See

     

    A primary cause for this warning is when the geometry is electrically very small. This causes the MoM matrix to be almost numerically singular.

    It is implied that the problem is being solved at a frequency that is too low. One solution is to use double precision memory storage. This is set in CADFEKO under Solver Settings, or if the user is using only EDITFEKO for the model setup, in the EG card.

    Double precision is also useful when very sensitive results are required. For example in an EMC problem where isolation values of several tens of dBs are expected.

    Another option is to use low frequency stabilisation, but this will increase the runtime.

Categories