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# Adding a moving heat source (convection heat transfer) in ABAQUS without user Subroutine?

## Adding a moving heat source (convection heat transfer) in ABAQUS without user Subroutine?

(OP)
Hello Everybody

In fact i want to simulate a situation where a stationary nozzle is spraying cold liquid on moving body OR in opposite case we can say that a moving nozzle is spraying cold liquid on stationary body.
My Target is to apply this thermal load assuming convection heat transfer problem in Abaqus without using any user subroutine.
Thank you for your time and response.

### RE: Adding a moving heat source (convection heat transfer) in ABAQUS without user Subroutine?

Normally you would have to use concentrated film condition defined with FILM subroutine. However I have another idea how to do it. Some time ago new features for additive manufacturing process simulations were added to Abaqus in form of built-in subroutines. Among these features there is so called moving heat source (or moving heat flux). It’s meant for moving laser heat sources but maybe it will work in your case too. For this feature you specify position, time when laser reaches this position and its power. Theoretically you could convert your heat transfer coefficient and sink temperature data to corresponding heat flux value (using the formula q=h(T_s-T_amb)). Then follow this:

q=E/t/A
P=E/t
q=P/A

So you can calculate power from heat flux q and area A. Then give this value for moving heat flux feature.

You can find information how to use this feature in the „Specifying s concentrated moving heat source” paragraph of „Thermomechanical analysis of powder bed-type additive manufacturing processes” in Analysis Guide of Abaqus documentation.

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