|December 15, 2010, 04:53||
units of geometrical parameters lost
Join Date: Dec 2010
Posts: 2Rep Power: 0
i think this is a rather common problem but i couldnt find a solution yet. I would like to make a thermal analysis where i have to vary a couple of parameters. the result should be the specific thermal resistance of my geometry. therefore, i need to multiply and add a couple of parameters in my parameter set in Ansys workbench.
p r o b l e m:
if I click the small box in the design modeler to make a dimension to be a parameter, the units are not transfered to the parameter set. however, the units of parameters in my steady-state thermal block are transfered to my parameter set. then, if i add or substract parameters in the parameter set using parameters from both blocks, it happens that the units are incorrect although the formula actually is correct. ansys states "Invalid operation:
1316 [kg^-1 m^-2 s^3 C] + 0.0005555 [kg^-1 s^3 C]"
is there some way to exclude the units like in MATLAB or what can i do to enable the units of my design modeler?
thanks a lot for your help
|December 20, 2010, 17:23||
Retired from CFD Online
Join Date: Mar 2009
Location: Ann Arbor, MI
Blog Entries: 1Rep Power: 39
We will work on making the function editor more tolerant of addins that don't include parameters.
In the mean time, here are 2 possible work arounds...
If you are using R13, you can insert an EXCEL system on the desk top. This system could take in the parameters and do your function without worrying about the units... it would produce an output parameter as your result which you could then optimize by.
You could also add units to your function... for instance, if X is a length parameter that should have been in mm, you could do the expression as:
Y = (5 mm) + (X * (1 mm))
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