link between ANSYS and HFSS

[zohre]

I have a question about the ansys software. when we link HFSS with Workbench of ansys (thermal static) , the imported data from hfss show scaling factor in addition of surface loss density. i would like to thanks if you tell me what is the concept of scaling factor?
should we multiply the value of surface loss to scaling factor?

 

[perejferrer]

Hi Zohre,

You don't have to get a confusion between Scale and Scaling Factor.

Once you have imported the HFSS simulation results into Workbench, you have a parameter named Scale. This parameter is equivalent to increase the source power (in Watts) used in the excitation of the ports in your design. So, if you have an application dealing with 10 W input power, you can excite your design (e.g. an antenna) with 10 W, and then in Workbench you have Scale = 1, or excite your design with 1 W, and the Scale = 10 (equivalent to 10 x 1 W == 10 W). I usually excite with 1 W, and then I look into the thermal vs power response by varying the Scale. However, other times, I want to be sure that I have a desired power in my design, so I set the power to the excitations, and then Scale = 1.

Moreover, the Scaling Factor refers to a mesh approximation between the imported dielectric losses dissipated in your design (import from HFSS), and the equivalence in Workbench mesh (to be used as source for temperature generation). The closer to 1, the better is the Scaling Factor, typically 0.97 or 1.02. You can improve this result by using a finer mesh in Workbench (increases thermal simulation time), and/or in HFSS too.

Good luck.

 

[zohre]

Dear perejferrer
Thank you very much for your response. it was very helpful for me.
if I do not change mesh, will the result mistake? (e.g, the scaling factor is 2)
in addition, to define radiation, is it important for structure? my design work under natural convection.
and How I can define the factor of emissivity. H do not know the value of this coefficient.
e.g for PTFE, Aluminum 6063, silver, phosphor bronze. do you know?
my design is into close metal tube.
thanks