[ali.ashouri]

Hi everyone


We simulate the VIV problems in the dynamic mesh method by utilizing UDF for 7 years with several computers in the ANSYS Fluent.


In the last 4 months, we have gotten an error during our problems when we use the UDF. So that, we do not have this error when we simulate other cases without UDF. We have only this error when we use UDF. We use Ansys Fluent 2021 R2 for now.


Note that our new computer was bought more than one year ago and had not had any problem for 9 months.


This Error is represented as below when we used 6 processes (ranks or threads or nodes):

Node 0: Process 6812: Received signal SIGSEGV

or sometimes:

Node 1: Process 4916: Received signal SIGSEGV

===================================================================================
=   BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES
=   RANK 1 PID 32 RUNNING AT DESKTOP-20GS1B2
=   EXIT STATUS: -1 (ffffffff)
===================================================================================

===================================================================================
=   BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES
=   RANK 2 PID 27494 RUNNING AT DESKTOP-20GS1B2
=   EXIT STATUS: -1 (ffffffff)
===================================================================================

===================================================================================
=   BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES
=   RANK 4 PID 4325 RUNNING AT DESKTOP-20GS1B2
=   EXIT STATUS: -1 (ffffffff)
===================================================================================

===================================================================================
=   BAD TERMINATION OF ONE OF YOUR APPLICATION PROCESSES
=   RANK 5 PID 3245 RUNNING AT DESKTOP-20GS1B2
=   EXIT STATUS: -1 (ffffffff)
===================================================================================

We have tested several approaches to resolve this error, which are listed below:

1) We changed the number of process from 6 to 1, 4, 8, 12, and 14 with different time steps but our problem was not resolved


2) We reinstall the windows 10, install Ansys 2021 R2 and Visual Studio 2017 again, and retried different process number and time steps (testing approach 1 again) but our problem was not resolved



3) We used VS 2015, 2013, 2019 in lieu of VS 2017, and testing approach 1 again but our problem was not resolved by none of them


4) We changed the version of Ansys 2021 R2 to 22 R1 and then to 22 R2, and testing approach 1 again but our problem was not resolved



Now we have not any idea to use it for resolving our problem.

Kind regards

[AlexanderZ]

what I would do
install older version and check the case:
1. if the is no problem -> fluent 2021 and earlier are the reason, contact ansys support
2. if there is a problem still -> other software somehow influence your setup