expression error in parametric set

keeper · February 14, 2012, 04:43

Hello everyone.

I am trying to define expression for first layer thickness as an input parameter in CFX study. But I am not able to define function exponantion (^).

The error message is: " unsupported operand type(s) for ^: 'float' and 'float'

How can I bypass this issue? Can anyone help please?

I have also one more question. Is it possible to modify mesh during the simulation? For example to calculate first few iterations and then use Reynolds number from this simulation to define first layer thickness for "improved simulation"?

Thanks for any reply.

Regards

monkey1 · February 14, 2012, 04:52

Have you tried ** instead of ^?
Just a guess as CFX uses a lot of FORTRAN and in FORTRAN you have to write **.

keeper · February 14, 2012, 05:02

thank you for quick reply. It really works so thanks again.

keeper · February 14, 2012, 05:04

concerning the second question any ideas pls?

monkey1 · February 14, 2012, 05:07

not really.
Except from running the simulation, stopping it at a special reynoldsnumber, remeshing, setting up a new file and restarting the computation...but i doubt it works automatically...

but as I said...dunno much about that...not to say nothing...never had such a problem and therefore never dealt with that subject...

keeper · February 14, 2012, 05:20

ok..and is it possible to use some output parameter as a part of expression for input parameter?

brunoc · February 14, 2012, 10:22

I guess you're running your case in Workbench, so yes, it is kind of possible. But WB doesn't really understand circular references, so every time your simulation is run and the output parameter is refreshed you have to hit the 'Update' button on WB so it restarts and updates everything with the new input parameter.

To make relations between parameters, simply click your input parameter at the 'Parameter Set' view and at the 'Description' box write the ID of the output parameter from the other cell (P1, P2, etc).

Cheers

February 14, 2012, 04:43	expression error in parametric set	#1
keeper Senior Member Join Date: Jul 2010 Posts: 152 Rep Power: 15	Hello everyone. I am trying to define expression for first layer thickness as an input parameter in CFX study. But I am not able to define function exponantion (^). The error message is: " unsupported operand type(s) for ^: 'float' and 'float' How can I bypass this issue? Can anyone help please? I have also one more question. Is it possible to modify mesh during the simulation? For example to calculate first few iterations and then use Reynolds number from this simulation to define first layer thickness for "improved simulation"? Thanks for any reply. Regards

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
What value shall I set for the Convergence criteria?	steventay	CFX	7	May 14, 2010 12:44
$FOAM_USER_APPBIN & LIBBIN variables not set	rassilon	OpenFOAM Installation	2	February 16, 2010 20:54
Compiling OpenFOAM13 on AMD64 with Redhat Enterprise	mbeaudoin	OpenFOAM Installation	20	June 17, 2008 06:43
Problem in installation of OpenFOAM	sachin	OpenFOAM Installation	7	January 22, 2008 01:40
Installation problems	shellbell1999	OpenFOAM Installation	9	April 6, 2006 13:29

February 14, 2012, 04:52		#2
monkey1 Senior Member Join Date: Jul 2011 Location: Berlin, Germany Posts: 173 Rep Power: 14	Have you tried instead of ^? Just a guess as CFX uses a lot of FORTRAN and in FORTRAN you have to write .

February 14, 2012, 05:02		#3
keeper Senior Member Join Date: Jul 2010 Posts: 152 Rep Power: 15	thank you for quick reply. It really works so thanks again.

February 14, 2012, 05:04		#4
keeper Senior Member Join Date: Jul 2010 Posts: 152 Rep Power: 15	concerning the second question any ideas pls?

February 14, 2012, 05:07		#5
monkey1 Senior Member Join Date: Jul 2011 Location: Berlin, Germany Posts: 173 Rep Power: 14	not really. Except from running the simulation, stopping it at a special reynoldsnumber, remeshing, setting up a new file and restarting the computation...but i doubt it works automatically... but as I said...dunno much about that...not to say nothing...never had such a problem and therefore never dealt with that subject...

February 14, 2012, 05:20		#6
keeper Senior Member Join Date: Jul 2010 Posts: 152 Rep Power: 15	ok..and is it possible to use some output parameter as a part of expression for input parameter?

February 14, 2012, 10:22		#7
brunoc Senior Member Bruno Join Date: Mar 2009 Location: Brazil Posts: 277 Rep Power: 21	I guess you're running your case in Workbench, so yes, it is kind of possible. But WB doesn't really understand circular references, so every time your simulation is run and the output parameter is refreshed you have to hit the 'Update' button on WB so it restarts and updates everything with the new input parameter. To make relations between parameters, simply click your input parameter at the 'Parameter Set' view and at the 'Description' box write the ID of the output parameter from the other cell (P1, P2, etc). Cheers