Error in CFX Solver

oliveira1820 · May 2, 2018, 22:40

Hello to everyone,

When I start the solver of my transient CFX fluid simulation I get this messagage at the first coefficient loop :

GETCORE stacktrace
1 Post_soln, ,CVVOL,ZN1/VERTICES,LATEST

Does anybody knows how to solve this problem or to what is related?

Thanks

Gert-Jan · May 3, 2018, 01:39

We more info than that. Can you provide the last part of your output file so we are able to see what is happening?

oliveira1820 · May 3, 2018, 02:57

I´m sorry, I´m new at this software and can´t find the output file anywhere. In the Post folder there isn´t any file, here can I find it?

AtoHM · May 3, 2018, 03:14

There should be a text file with <name of your simulation>.out
Thats the output file, which is also shown in CFX Solver Manager when monitoring the run. Depending on your calculation (serial or parallel) and if you run it locally or at a cluster or something, it can be placed at different places. Check if there is a standard working directory or something, it might be there. Or try windows search for *.out anywhere close to where you think it should be.

oliveira1820 · May 3, 2018, 07:52

OUT FILE.txt

Found it, here it is

AtoHM · May 3, 2018, 09:19

Actually I was hoping for a clearer error message, this is actually not very useful. However, I noticed you have highly skewed elements in the mesh statistics part, with your minimum angle at about 5 degree. As far as I remember from the manual, you should at least have 10 degree, everything upwards is favorable of course. I would start with improving mesh quality.

Opaque · May 3, 2018, 14:16

Not a trivial error to diagnose. Some calculation failed while getting ready to write the first transient file

Try removing the transient file output first, and see if you can run say 5 timesteps to see if the final results files can be written.

Otherwise, try contacting ANSYS CFX support and provide your definition file.

Gert-Jan · May 3, 2018, 16:36

Hi Pedro,

You mentioned you are new to the software, but the case that you setup looks pretty complex (H2Ovl-system, total energy, etc). That does not really match. What are you trying to solve?

Regs, Gert-Jan

oliveira1820 · May 10, 2018, 02:06

Hi guys, I tried improve my mesh but keep getting the same error:

"GETCORE stacktrace
1 Post_soln, ,CVVOL,ZN1/VERTICES,LATEST"

Do you know how can I improve the mesh and raise the minimum angle?

oliveira1820 · May 10, 2018, 02:07

Gert-Jan, I´m working with a thermodynamic nuclear target simulation with cooling water system and studiyng the condesation/vaporization of the water inside too.

oliveira1820 · May 10, 2018, 02:41

Opaque, I removed the transient file and it calculated the solutions for 5 iterations, but then the solving stopped again and the same error appeared.

Gert-Jan · May 10, 2018, 07:49

My advice is to go back to basics. You are new to the software but are trying to include all physics from the start. That is asking for failure. Even I never do that.

So take your mesh and start as simple as you can imagine. And see of that works.
Step 1: do a simple simulation with water flowing through your domain. Does that work?
Step 2: Add sim ple heat transfer.Does that work?
Step 3: Add source terms and viscous heat (Do you really need that?)
Step 4: Add multiphase.
Step 5: Make it transient

Then you will bump into the error and may find the cause.

BTW, You have a very small license and you are focussing on modelling physics. Not a windmill or a solar car with Cw=0.1 where mesh is very important. So forget the mesh. CFX can handle very bad mesh. First get the physics right and then at second thought look to the mesh.

May 2, 2018, 22:40	Error in CFX Solver	#1
oliveira1820 Senior Member Pedro Oliveira Join Date: Feb 2018 Location: Portugal Posts: 109 Rep Power: 8	Hello to everyone, When I start the solver of my transient CFX fluid simulation I get this messagage at the first coefficient loop : GETCORE stacktrace 1 Post_soln, ,CVVOL,ZN1/VERTICES,LATEST Does anybody knows how to solve this problem or to what is related? Thanks

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May 3, 2018, 01:39		#2
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,827 Rep Power: 27	We more info than that. Can you provide the last part of your output file so we are able to see what is happening?

May 3, 2018, 02:57		#3
oliveira1820 Senior Member Pedro Oliveira Join Date: Feb 2018 Location: Portugal Posts: 109 Rep Power: 8	I´m sorry, I´m new at this software and can´t find the output file anywhere. In the Post folder there isn´t any file, here can I find it?

May 3, 2018, 03:14		#4
AtoHM Senior Member M Join Date: Dec 2017 Posts: 642 Rep Power: 12	There should be a text file with <name of your simulation>.out Thats the output file, which is also shown in CFX Solver Manager when monitoring the run. Depending on your calculation (serial or parallel) and if you run it locally or at a cluster or something, it can be placed at different places. Check if there is a standard working directory or something, it might be there. Or try windows search for *.out anywhere close to where you think it should be.

May 3, 2018, 07:52		#5
oliveira1820 Senior Member Pedro Oliveira Join Date: Feb 2018 Location: Portugal Posts: 109 Rep Power: 8	OUT FILE.txt Found it, here it is

May 3, 2018, 09:19		#6
AtoHM Senior Member M Join Date: Dec 2017 Posts: 642 Rep Power: 12	Actually I was hoping for a clearer error message, this is actually not very useful. However, I noticed you have highly skewed elements in the mesh statistics part, with your minimum angle at about 5 degree. As far as I remember from the manual, you should at least have 10 degree, everything upwards is favorable of course. I would start with improving mesh quality.

May 3, 2018, 14:16		#7
Opaque Senior Member Join Date: Jun 2009 Posts: 1,804 Rep Power: 32	Not a trivial error to diagnose. Some calculation failed while getting ready to write the first transient file Try removing the transient file output first, and see if you can run say 5 timesteps to see if the final results files can be written. Otherwise, try contacting ANSYS CFX support and provide your definition file.

May 3, 2018, 16:36		#8
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,827 Rep Power: 27	Hi Pedro, You mentioned you are new to the software, but the case that you setup looks pretty complex (H2Ovl-system, total energy, etc). That does not really match. What are you trying to solve? Regs, Gert-Jan

May 10, 2018, 02:06		#9
oliveira1820 Senior Member Pedro Oliveira Join Date: Feb 2018 Location: Portugal Posts: 109 Rep Power: 8	Hi guys, I tried improve my mesh but keep getting the same error: "GETCORE stacktrace 1 Post_soln, ,CVVOL,ZN1/VERTICES,LATEST" Do you know how can I improve the mesh and raise the minimum angle?

May 10, 2018, 02:07		#10
oliveira1820 Senior Member Pedro Oliveira Join Date: Feb 2018 Location: Portugal Posts: 109 Rep Power: 8	Gert-Jan, I´m working with a thermodynamic nuclear target simulation with cooling water system and studiyng the condesation/vaporization of the water inside too.

May 10, 2018, 02:41		#11
oliveira1820 Senior Member Pedro Oliveira Join Date: Feb 2018 Location: Portugal Posts: 109 Rep Power: 8	Opaque, I removed the transient file and it calculated the solutions for 5 iterations, but then the solving stopped again and the same error appeared.

May 10, 2018, 07:49		#12
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,827 Rep Power: 27	My advice is to go back to basics. You are new to the software but are trying to include all physics from the start. That is asking for failure. Even I never do that. So take your mesh and start as simple as you can imagine. And see of that works. Step 1: do a simple simulation with water flowing through your domain. Does that work? Step 2: Add sim ple heat transfer.Does that work? Step 3: Add source terms and viscous heat (Do you really need that?) Step 4: Add multiphase. Step 5: Make it transient Then you will bump into the error and may find the cause. BTW, You have a very small license and you are focussing on modelling physics. Not a windmill or a solar car with Cw=0.1 where mesh is very important. So forget the mesh. CFX can handle very bad mesh. First get the physics right and then at second thought look to the mesh.