Symmetry with the workbench

[davidrdguez]

Hi there,

I'm trying to run a simulation in the workbench; it's a 2D thermal simulation.

Since it is symmetric I only designed half of it.

In the mechanical I insert the symmetric region. It is a line. and the symmetric normal (an axis)

I have problems with the results. They are the same with the symmetry or without.

I drew the full model (double of it) and indeed I get a different result (double, which makes sense).

Does anyone know anything about the symmetry in the workbench?

Thank you
Regards,

 

[MrMyers]

You need to consider two things before you use symmetry:
- Is the geometry symmetric, and,
- Is the thermal load symmetric

Thermal symmetry can be considered the same as a perfectly insulated wall. If your results aren't behaving, then one or both of the above requirements is not satisfied.

Posting more information (i.e. an illustration) of your problem and might help us solve it.

Cheers

 

[davidrdguez]

Hi there,

I might understand it wrong, but I see it completely symmetric in both geometry and load. Actually I decided to cut into two in order to make it easier.

Attached a drawing of a sketch (sorry, i don't have ansys access right now).

Let's think about a rectangle. Heat flux at the bottom (W/m2), convection (W/m2ºK) all the other faces around. I cut the rectangle into two and apply the symmetry region.

So the result of the delivered Watts in the cut version (with the symmetry!) are half in comparison to the full model

Cheers,