[lbj007]

Hi,
I'm using Solid Oxide Fuel Cell With Unresolved Electrolyte Module,totally following the guide:https://www.afs.enea.it/project/nept...lls/node57.htm
and when I click initialization,the following error occurs:

I've searched for possible reasons in this forum,and I think it's not about udf/udm since I only use the Built-in module with all needed udf/udm set up already,and another possible reason I've found is about parallel/serial,now I'm using serial mode,but then I know that in higher version after 17.0,the serial mode is actually parallel,and I'd like to start fluent with command: fluent 3d -t0, and when initialize it occurs:

but I don't know how to start fluent with double precision mode with command line,I looked up the relevant guide and can't find the corresponding command, or maybe there is other problem I can't find.
Sorry you have to browse so many words,I'm just a beginner, and if there are any possible reason leading to the error such as grid quality/boundary condition problem,please let me know, and of course I hope someone can fix this problem.

ps：here is my module which is very simple and the grid quality report,


Best Regards

[vinerm]

Any industrial scale simulation or one where the field variation is very small, e.g., velocity changes from one cell to adjacent are different by only 1e-6 or smaller, double precision becomes vital.

To start in double precision, all you need to mention is dp, e.g.,

fluent <3d|3ddp|2d|2ddp>

Choose one of the four options above.

[lbj007]

Originally Posted by vinerm

Any industrial scale simulation or one where the field variation is very small, e.g., velocity changes from one cell to adjacent are different by only 1e-6 or smaller, double precision becomes vital.

To start in double precision, all you need to mention is dp, e.g.,

fluent <3d|3ddp|2d|2ddp>

Choose one of the four options above.

Thanks for your help, now I successfully start it with serial mode, but it shows:


another problem...

[vinerm]

This is a very common error and arises whenever Fluent or any program tries to access a memory that is not available. That means, there is something missing in the setup. Ensure that you have enough UDMs, as required by the module, and the module is initialized properly.

[lbj007]

Originally Posted by vinerm

This is a very common error and arises whenever Fluent or any program tries to access a memory that is not available. That means, there is something missing in the setup. Ensure that you have enough UDMs, as required by the module, and the module is initialized properly.

Hi,
I just found another warning, I don't know if it is related

[vinerm]

This is not important. You can ignore it. All it expects is that a passwordless system is setup and the password is available for spawning multiple nodes.

[lbj007]

Originally Posted by vinerm

This is not important. You can ignore it. All it expects is that a passwordless system is setup and the password is available for spawning multiple nodes.

ok，thanks a lot, so even if I use parallel mode,can I ignore it? and another question, is MPI needed when using parallel mode? I wonder if it is the reason causing the first problem.

Best Regards

[vinerm]

I suppose you are already tried parallel. As long as it is on the same machine, it won't be an issue. MPI is required for running in parallel, however, that's already installed as a part of Ansys Suite. So, you don't need to do anything extra.

[lbj007]

Originally Posted by vinerm

I suppose you are already tried parallel. As long as it is on the same machine, it won't be an issue. MPI is required for running in parallel, however, that's already installed as a part of Ansys Suite. So, you don't need to do anything extra.

Oh, I checked the MPI folder in computer, it shows:


does that means it is successfully installed? now I can ensure there is something wrong with my udf/udm settings, Thanks a lot for your time and help!

Best Regards

[moni91]

Hi everyone

I have a similar problem.
Also I am using the SOFC module and it becomes impossible for me to initialize, simply after adding the module.
To add the module, I type the command:

define>models>add module>4

after doing this, the module is added in the off mode (disabled).
After doing this if I try to initialize this message appears:

================================================= ===========================

Node 0: Process 14808: Received signal SIGSEGV.

================================================= ============================

================================================= ============================

Node 1: Process 2328: Received signal SIGSEGV.

================================================= ============================

================================================= ===========================

Node 2: Process 18992: Received signal SIGSEGV.

================================================= ===========================

================================================= ============================

Node 3: Process 11040: Received signal SIGSEGV.

================================================= ============================
MPI Application rank 0 exited before MPI_Finalize () with status 2
The fl process could not be started.

Fluent is started in parallel and double precision mode.
I sincerely thank everyone who takes a minute to help me.

[hicham14]

Hello, please did you find the solution, I have the same problem,
thanks,

[hicham14]

hello, I have the same problem, please help me,

[moni91]

Originally Posted by hicham14

hello, I have the same problem, please help me,

I am sorry
We were not able to solve the problem for we did not carry out the electrochemical analysis but only the fluid dynamics one