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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

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## 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

Erik

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## 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!

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## 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.

Erik

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