August 4, 2023 at 6:07 amRaheem Shaik (IIT KGP)Subscriber
I am using udf to print the variables in a text file. It is printing the results but for each timestep, it is printing two times. First, it is showing the correct values and next time it is printing -1#IND00 values. I don't know the reasong for printing like this. I am attaching the image of the printing file. Please reply if anyone knows about the issue.
August 4, 2023 at 10:34 amRobAnsys Employee
How many nodes are you running on? How many phases are there?
August 4, 2023 at 10:40 amRaheem Shaik (IIT KGP)Subscriber
Parallel (local machine)
solver processes: 1
Fluent is running on 6 CPU cores.
Domain is having 12000 nodes and only single phase is there.
August 4, 2023 at 10:59 amRobAnsys Employee
OK, so it's not likely to be a parallel issue. If you set up a report for those values in Fluent how does the plot look?
August 4, 2023 at 11:14 amRaheem Shaik (IIT KGP)Subscriber
Plots are normal. It is taking correct values only for every time step. Only problem is with printing.
I have another doubt about the verbosity. I have set that to 1 to see equations tolerance. After some time of simulation, temperature equation tolerance going like 1.643e+3 and then it is stopping the simulation with the message "" Exit as omega becomes NaN for a norm of s equals to 0.0000e+00 "". I am getting floating point exception. I have no idea how to get rid of the issue.
August 4, 2023 at 11:17 amRobAnsys Employee
That's diverging. Have a look at the flow field just before it fails to see what's going on.
August 4, 2023 at 11:28 amRaheem Shaik (IIT KGP)Subscriber
Actually i have printed the values of the flow variables(Pressure and temperature of the domain) at every iteration using define_adjust macro. I have not observed any abnormal values before error encountered.
August 4, 2023 at 11:38 amRaheem Shaik (IIT KGP)Subscriber
Thank you for giving response.
First error in printing now got resolved. Actually problem is with udf Define_execute_at_end where i gave file open pointer inside the macro. Now I have kept it before the macro. It is printing correctly now without -1#IND00 values..
August 4, 2023 at 12:21 pmRobAnsys Employee
If it's "just failing" try and restart from an autosave. Otherwise look at what's going on in the flow (images not just numbers) to see if something is going on.
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