cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
Showing results for 
Search instead for 
Did you mean: 

Multiple convection coefficients?

Highlighted
Newbie

Multiple convection coefficients?

Does anyone know if its possible to simulate a steel plate that is subjected to a high convection coefficient and high bulk temp for the, say, first 4 - 5 seconds, and then subsequently be subjected to a low convection coefficient and low bulk temp for the remaining 2-3 minutes?

I want to simulate a steel plate that is subjected to a welding torch on one side of the plate for 4-5 seconds and then move the welding torch away from the plate.

Is this just a matter of combining constraint sets? Thanks,

Paul

3 REPLIES 3
Highlighted

Re: Multiple convection coefficients?

Hi Paul

In a transient thermal you can add a time function to a convection condition, look at the attached picture.

If you need more info, do not hesitate to ask!

Regards

ErikTimefunct.jpg

Highlighted

Re: Multiple convection coefficients?

Hi Erik,

I can see from the image that it's possible to apply a temporal variation on the bulk temperature by defining an equation or table, but I'm more interested in having the convection coefficient change value as a function of time.

For example, can the convection coeff in your model (.1 mW/(mm^2 C) change to another value over time? Or is there something in the pull down menu from the pic you've attached that shows this and I'm somehow missing it? thanks!

Highlighted

Re: Multiple convection coefficients?

Hi Paul

You're right it looks like it's only the bulk temperature. Maybe you can work with that in a similar fashion as heat transfer is proportional to convection condition times temp difference. If you make the temperature difference small, there is little or no convection.

Or differently, I would model your welding torch as a heat load, which can vary over time using a function or a table.

heatload-timefunc.jpg

Erik

Announcements