To save the brick as a part, from the toolbar at the top of the window use the File pull-down
menu to save the Part as “brick”. To also save the brick as an assembly, use the File pull-down
menu to select New, then Assembly, and then click OK. From the Begin Assembly section in the
Part/Assembly to Insert window select the name of the part you just created and click the green
check mark to insert the brick into the assembly at the origin. Finally, use the File pull-down
menu to save the Assembly as “brick_assembly”. Note you must work from an Assembly file
instead of a Part file for a simulation if you need to set internal power generation or an initial
condition for an entire part.
Simulation Setup
To create a simulation tab, from the toolbar at the top of the window use the Simulation pull-
down menu to select Study. In the Type window select the Thermal button, for Name enter
Steady 2D, under Options select Use 2D Simplification, and then click the green check mark.
New windows will open that allow you to specify the parameters for the 2D simplification. In the
Study Type window insure that Extruded is selected. In the Section Definition window for the
Section Plane select the front face of the brick (that is normal to the z-axis), set the Section depth
to 0.10 m, and then click the green check mark. Note that if internal heat generation is specified,
the volume of the part will be based on the Section depth. Also, note that a new tab has been
created at the bottom called Steady 2D and just the front face of the brick is now displayed in the
drawing window.
PDE Specification and Units Selection
To specify the PDE to solve, on the lower left in the new Simulation Tree right click on Steady
2D and select Properties from the pop-up menu. In the Thermal window under the Options tab
insure that Steady state is selected. Note that the system of linear algebraic equations can be
solved using either direct matrix inversion (Gaussian elimination or Direct Sparse) or iteration
(Gauss-Seidel or FFE Plus). For meshes up to about 100,000 elements direct matrix inversion
should be faster. Select Automatic which chooses the method that is fastest for the current
problem. Click the Advanced Options button and set the Convergence tolerance to 0.0001%,
insure the Under-relaxation factor for the iteration is set to Automatic, and click OK.
To set the default unit system, in the Simulation Tree right click on Parts and select Options
from the pop-up menu. In the System Option window under the Default Options tab set the Unit
system to SI (MKS).
Boundary Conditions
To set constant temperature boundary conditions on all the edges, in the Simulation Tree right
click on Thermal Loads and select Temperature from the pop-up menu. In the Type window for
the Faces, Edges or Vertices select the bottom three edges. In the Temperature window set the
temperature to 0 ˚C and then click the green check mark. Repeat this process to set the
temperature to 100 ˚C for the top edge.
Mesh
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