Fix the naming of the fluid heat capacity

[frankfeifan]

This PR changes the naming of heat capacity in the fluid model as previous volumetricHeatCapacity is misleading. We are actually using the heat capacity for a specific fluid mass (unit: J/K/kg).

This PR is also related to the issue #2923

integratedTests PR: https://github.com/GEOS-DEV/integratedTests/pull/81

[jhuang2601]

What is the correct unit and name of the Heat Capacity in SolidInternalEnergy?

[frankfeifan]

What is the correct unit and name of the Heat Capacity in SolidInternalEnergy?

For SolidInternalEnergy, the unit of heat capacity should be J/K/m^3 according to the calculation here. So the name is correct for the solid model.

[jhuang2601]

What is the correct unit and name of the Heat Capacity in SolidInternalEnergy?

For SolidInternalEnergy, the unit of heat capacity should be J/K/m^3 according to the calculation here. So the name is correct for the solid model.

Thanks @frankfeifan for this clarification. For the existing tutorial example, heat capacity for solid should be 1.672e5 J/K/m^3, which was provided by reference work.

[frankfeifan]

What is the correct unit and name of the Heat Capacity in SolidInternalEnergy?

For SolidInternalEnergy, the unit of heat capacity should be J/K/m^3 according to the calculation here. So the name is correct for the solid model.

Thanks @frankfeifan for this clarification. For the existing tutorial example, heat capacity for solid should be 1.672e5 J/K/m^3, which was provided by reference work.

Yes. I think the values of heat capacity for both fluid and solid in this tutorial should be reasonable, maybe a bit smaller than their real values from experiment, e.g., the heat capacity of water is around 4e3 J/K/kg. But I think it should be fine just for model verification.

The issue here is that the current name of fluid heat capacity is misleading, and its unit is actually different from that of the solid (J/K/kg v.s. J/K/m^3). That's why the heat capacity values for the solid and fluid are very different in the tutorial example.

[sytuannguyen]

@frankfeifan I would propose to consider Specific Heat Capacity in place of Heat Capacity.

[frankfeifan]

@frankfeifan I would propose to consider Specific Heat Capacity in place of Heat Capacity.

Yes. specificHeatCapacity is a better option. I have updated the code accordingly.