internalHeatSource in 2D, 3D, and axisymmetric PDE

Hi, I am implementing internalHeatSource objects within a heat transfer PDE. I'm looking for clarity about the units for 2D, 3D, and 2D axisymmetric simulations.

In 3D simulations, I know internalHeatSource takes units of W/m3. I'm wondering if it's the same for 2D and 2D axisymmetric simulations.

If we use internalHeatSource in a 2D simulation, does it just assume unit depth (1m)? And do axisymmetric simulations correctly process the internalHeatSource input based on the perpendicular cross-section?

I figured this was the case, but I could not find explicit documentation in the user's guide. I also got strange results when I transformed my 3D cylindrical study into a 2D axisymmetric study using the same values in internalHeatSource.

Thanks!

Answer 1

[Supraja]

I understand that you want to differentiate between the inputs of the “internalHeatSource” Assignment Properties of 2D and 3D simulations.

You can use the “internalHeatSource” function using the syntax: internalHeatSource(thermalmodel,heatSourceValue,RegionType,RegionID).

The units for 2D and 2D axisymmetric simulations are same.

You can find the region IDs by using “pdegplot”.

Here is the link for documentation of internalHeatSource properties:https://www.mathworks.com/help/pde/ug/pde.thermalmodel.internalheatsource.html?s_tid=doc_ta

For HeatSource Assignment Properties: https://www.mathworks.com/help/pde/ug/pde.heatsourceassignment-properties.html#d124e75179

Find HeatSource assigned to a geometric region: https://www.mathworks.com/help/pde/ug/pde.heatsourceassignmentrecords.findheatsource.html