timescale factor switching

keeper · October 30, 2013, 04:22

Hello all.

I want to swith autotimescale factor automatically after certain number of iteration. Right now I have to switch it manually in CFX Solver Manager.

Is there any setting (expression) that can do it automatically?

Thank you for any reply.

Best Regards

ghorrocks · October 30, 2013, 04:50

No, but you can use edit run in progress to change it without requiring a restart.

keeper · October 30, 2013, 08:24

That is what I want to avoid

I thought there could be some expression like when Time Step = 15 then switch autotimescale to 10.

ghorrocks · October 30, 2013, 16:27

Have you tried setting the autotimescale factor to a CEL expression then using a CEL expression like if(aitern>15,10,1)?

keeper · October 31, 2013, 02:55

Thank you for response. No I haven't, that is exactly what I wanted to know. Perfect! Thanks a lot Glenn.

Regards

keeper · August 5, 2015, 04:10

Hello all,

does anyone know, if solid timescale factor can be switched automatically by using similar (or same) expression as fro fluid timescale factor?

Thank you for any help.

Best regards

ghorrocks · August 5, 2015, 05:33

I think so, but some parameters are not settable by expressions so I cannot be sure. So try it and find out.

keeper · August 6, 2015, 03:12

So I've just copied and renamed the expression and this is error message that I got:

Parameter 'Solid Timescale Factor' in object '/FLOW:Flow Analysis 1/SOLVER CONTROL/CONVERGENCE CONTROL' is not allowed to be assigned an expression value that depends on variables. It must be assigned a numeric value, or an expression that resolves to a constant value.

Have you any idea how to modify it please?

Thank you

ghorrocks · August 6, 2015, 03:16

The message is very clear - you cannot vary it during a run.

To vary it you will need to stop, change the CCL and restart. You could also do a change run in progress.

keeper · August 6, 2015, 03:19

Ok, I change material properties during the run by using command:

cfx5control -inject-commands CFX.ccl CFX_001.dir

This allows you to rewrite what you need without stopping the solver. But you have to set the working directory in pending tasks folder and have ccl inside.

Anyway thank you for help.

Best regards

October 30, 2013, 04:22	timescale factor switching	#1
keeper Senior Member Join Date: Jul 2010 Posts: 152 Rep Power: 15	Hello all. I want to swith autotimescale factor automatically after certain number of iteration. Right now I have to switch it manually in CFX Solver Manager. Is there any setting (expression) that can do it automatically? Thank you for any reply. Best Regards

August 5, 2015, 04:10	solid timescale factor switching	#6
keeper Senior Member Join Date: Jul 2010 Posts: 152 Rep Power: 15	Hello all, does anyone know, if solid timescale factor can be switched automatically by using similar (or same) expression as fro fluid timescale factor? Thank you for any help. Best regards

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October 30, 2013, 04:50		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	No, but you can use edit run in progress to change it without requiring a restart.

October 30, 2013, 08:24		#3
keeper Senior Member Join Date: Jul 2010 Posts: 152 Rep Power: 15	That is what I want to avoid I thought there could be some expression like when Time Step = 15 then switch autotimescale to 10.

October 30, 2013, 16:27		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Have you tried setting the autotimescale factor to a CEL expression then using a CEL expression like if(aitern>15,10,1)?

October 31, 2013, 02:55		#5
keeper Senior Member Join Date: Jul 2010 Posts: 152 Rep Power: 15	Thank you for response. No I haven't, that is exactly what I wanted to know. Perfect! Thanks a lot Glenn. Regards

August 5, 2015, 05:33		#7
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	I think so, but some parameters are not settable by expressions so I cannot be sure. So try it and find out.

August 6, 2015, 03:12		#8
keeper Senior Member Join Date: Jul 2010 Posts: 152 Rep Power: 15	So I've just copied and renamed the expression and this is error message that I got: Parameter 'Solid Timescale Factor' in object '/FLOW:Flow Analysis 1/SOLVER CONTROL/CONVERGENCE CONTROL' is not allowed to be assigned an expression value that depends on variables. It must be assigned a numeric value, or an expression that resolves to a constant value. Have you any idea how to modify it please? Thank you

August 6, 2015, 03:16		#9
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	The message is very clear - you cannot vary it during a run. To vary it you will need to stop, change the CCL and restart. You could also do a change run in progress.

August 6, 2015, 03:19		#10
keeper Senior Member Join Date: Jul 2010 Posts: 152 Rep Power: 15	Ok, I change material properties during the run by using command: cfx5control -inject-commands CFX.ccl CFX_001.dir This allows you to rewrite what you need without stopping the solver. But you have to set the working directory in pending tasks folder and have ccl inside. Anyway thank you for help. Best regards