When the fluent runs, it abruptly give the errors below, and I cannot run afterwards,

hitzhwan · February 26, 2020, 17:57

When the fluent runs, it abruptly give the errors below, and I cannot run afterwards, what's the reason?

The fl process could not be started.
MPI Application rank 0 exited before MPI_Finalize() with status -1

Svetlana · February 28, 2020, 00:18

Does it work in serial mode?

hitzhwan · March 2, 2020, 22:42

Quote:

Originally Posted by Светлана

Does it work in serial mode?

No，it just operate in a single computer， but I calculate it by parallel model.

Svetlana · March 2, 2020, 22:44

Does it give you this error in serial mode (without parallel)?

vinerm · March 3, 2020, 08:30

The fl process could not be started is a very generic error. Once this error has appeared, Fluent needs to be closed. And this can only be done by killing the process. You may either use kill script written by Fluent or using kill command or Task Manager (in Windows). Once this command appears, most likely, all the memory is flushed out, hence, nothing remains in Fluent. It does not accept any command.

The reasons for the error could be anything ranging from unavailability of some important data to buffer overflow or unavailability of resources. If it is resources, try using more RAM. For each million cells, the machine should have at least 4 GB RAM. For double precision, it should be at least 8 GB. Even a machine with half of it will load the case but will not be able to run it. Second important part to be looked at is the mesh and setup. Check if mesh passes the grid check test without any issue. If it does, check the quality. Then verify the whole setup, starting from models all the way to numerical schemes being used. Another important aspect is initialization. If initial values are bad, Fluent may get into issues.

hitzhwan · March 3, 2020, 17:37

Quote:

Originally Posted by Светлана

Does it give you this error in serial mode (without parallel)?

I do not know how use it in serial model, can you tell me how to do it?

Svetlana · March 3, 2020, 19:36

Serial mode - it is an option in the Fluent launcher. It is in the same section where you tell it how many CPUs to use.

vinerm · March 4, 2020, 04:34

As Svetlana mentioned, you need to choose the option at the Fluent launcher. However, if you are using a rather newer version, then this won't work. You have to start Fluent with argument -t0, i.e., type the following command in the terminal

fluent <3ddp|2ddp|3d|2d> -t0

If you are using Windows, then you have to type this in command prompt. Do note that this requires that the Path for Fluent is set up properly. If not, you have to use full path where Fluent is installed. From the four options given after fluent, you need to choose one as per your requirement. E.g., if you want to start Fluent in three-dimensional, double precision, then use the following command

fluent 3ddp -t0

February 26, 2020, 17:57	When the fluent runs, it abruptly give the errors below, and I cannot run afterwards,	#1
hitzhwan Senior Member Join Date: Dec 2017 Posts: 388 Rep Power: 10	When the fluent runs, it abruptly give the errors below, and I cannot run afterwards, what's the reason? The fl process could not be started. MPI Application rank 0 exited before MPI_Finalize() with status -1 Last edited by hitzhwan; February 27, 2020 at 11:53.

March 3, 2020, 08:30	Error	#5
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 36	The fl process could not be started is a very generic error. Once this error has appeared, Fluent needs to be closed. And this can only be done by killing the process. You may either use kill script written by Fluent or using kill command or Task Manager (in Windows). Once this command appears, most likely, all the memory is flushed out, hence, nothing remains in Fluent. It does not accept any command. The reasons for the error could be anything ranging from unavailability of some important data to buffer overflow or unavailability of resources. If it is resources, try using more RAM. For each million cells, the machine should have at least 4 GB RAM. For double precision, it should be at least 8 GB. Even a machine with half of it will load the case but will not be able to run it. Second important part to be looked at is the mesh and setup. Check if mesh passes the grid check test without any issue. If it does, check the quality. Then verify the whole setup, starting from models all the way to numerical schemes being used. Another important aspect is initialization. If initial values are bad, Fluent may get into issues. __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.

March 4, 2020, 04:34	Serial and Parallel	#8
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 36	As Svetlana mentioned, you need to choose the option at the Fluent launcher. However, if you are using a rather newer version, then this won't work. You have to start Fluent with argument -t0, i.e., type the following command in the terminal fluent <3ddp\|2ddp\|3d\|2d> -t0 If you are using Windows, then you have to type this in command prompt. Do note that this requires that the Path for Fluent is set up properly. If not, you have to use full path where Fluent is installed. From the four options given after fluent, you need to choose one as per your requirement. E.g., if you want to start Fluent in three-dimensional, double precision, then use the following command fluent 3ddp -t0 __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.

February 28, 2020, 00:18		#2
Svetlana Senior Member Svetlana Tkachenko Join Date: Oct 2013 Location: Australia, Sydney Posts: 416 Rep Power: 15	Does it work in serial mode?

March 2, 2020, 22:44		#4
Svetlana Senior Member Svetlana Tkachenko Join Date: Oct 2013 Location: Australia, Sydney Posts: 416 Rep Power: 15	Does it give you this error in serial mode (without parallel)?

March 3, 2020, 19:36		#7
Svetlana Senior Member Svetlana Tkachenko Join Date: Oct 2013 Location: Australia, Sydney Posts: 416 Rep Power: 15	Serial mode - it is an option in the Fluent launcher. It is in the same section where you tell it how many CPUs to use.