How to simulate without heatsink?

[Brilight]

Hi there, thanks for your contribution!

I am curious that can your tool simulate scenarios without a heatsink, i mean only convective boundary conditions with air: k\nabla T = h(T - T_{amb}), where h is the heat transfer coefficient? Thanks!

[ashduizxc]

Hi there, thanks for your contribution!

I am curious that can your tool simulate scenarios without a heatsink, i mean only convective boundary conditions with air: k\nabla T = h(T - T_{amb}), where h is the heat transfer coefficient? Thanks!

Hello, I would like to inquire if you have solved this problem?

[PariaDarbani]

Simulating Designs Without Heat Sinks, Heat Spreaders and TIM

However, it is pretty easy to run a simulation in which they are effectively nonexistent and the top surface is effectively adiabatic by changing some thermal properties in the configuration file. In particular, you want to:

• Make c_convec very small so that there is effectively no convection capacitance.
• Make r_convec very large so that there is effectively an infinite convection resistance.
• Make -t_sink, t_spreader, and (for non-3D simulations), t_interface very small so that the heat sink, heat spreader, and TIM all have a negligible thickness.
• Make k_sink, k_spreader, and (for non-3D simulations), k_interface very small so that the heat sink, heat spreader, and TIM all have negligible thermal conductivity.
• Make p_sink, p_spreader, and (for non-3D simulations), p_interface very small so that the heat sink, heat spreader, and TIM all have a negligible volumetric heat capacity (and thus a negligible thermal capacitance).

By changing these parameters, we can make the heat sink, heat spreader, and TIM negligible. A convenient technique to set -k_sink, -k_spreader, -k_interface, -p_sink, -p_spreader, and -p_interface is to define a material in the materials file named none with very small thermal conductivity and volumetric heat capacity. Then, you can simply set -material_sink, -material_spreader, and -material_interface to the none material.