User Guide: Forced Convection Heat Transfer
In this user guide, we explain the simulation process of forced convective heat transfer in Rasberry Pi (Electronic cooling).
Link to project containing the geometry:
Import tutorial project into workbench
- Its important we create topological entities which can be later easily assigned to boundary conditions
- we have in total 95 faces
- Inlet and outlet faces form two topological entities. Left click on them to highlight them and create topological entities as shown below
- The chip faces are also categorized as topological entities.
- The bottom surface is categorized as board
- All the remaining surfaces are to be categorized as walls. Use the Active box selection to select all the faces and deselect the faces from the previous topological entities ‘walls’
- Left click on the mesh icon to create a new mesh.
- Choose the Hex-Dominant parametric (only CFD) Algorithm.
- Choose the meshing mode as internal
- Choose the Sizing to be Automatic and the number of processors to be 32 as shown below:
Boundary Layer refinement
- The generated mesh is presented below:
- Give the model a gravitation field as shown below:
Default values for initial condition parameters are usually enough. If these parameters estimated correctly, the solution will converge faster.
- We need to define boundary conditions for each of the topological entities that have been created.
- The settings for each of the topological entities are mentioned below
- Inlet: we give a velocity inlet boundary condition and give a velocity of 0.1 m/s.
- Outlet: we give a pressure outlet condition with zero gauge pressure
- Chip 1: We give a wall boundary condition with fixed temperature as 321K.
- Chip 2: We give a wall boundary condition with fixed temperature as 364K.
- Board: A wall with fixed temperature of 297K
- Walls: The remaining walls are given as zero gradient (adiabatic walls) with no slip boundary condition
The default settings are usually suitable. Experienced users can use Manual settings for better convergence.
- The settings for the simulation control are given below:
- please click on the ‘+’ next to Simulation runs to start a new simulation