Thermal transient analysis¶

Perform a thermal transient analysis.

Loads¶

Open the load case container, where load cases can be defined (CTRL+K on load case to configure).

Add load case¶

Add a load case to the load case container. To configure the load case, click CTRL+K on the load case.

Configure selected load¶

Define and configure the load case.

Link¶

Define at which link the load is applied.

Thermal load¶

Define the thermal load that is applied to the system. Three types of thermal loads can be defined.

Type	Thermal load
Convection	Convection load applied to entity in [K]
Heat flux	Heat flux load apploed to entity in [W/m²]
Heat flow	Heat flow load applied to entity in [W]

Add convection load¶

Add a convection load to the load case.

Add heat flux load¶

Add a heat flux load to the load case.

Add heat flow load¶

Add a heat flow load to the load case.

ODE Solver¶

Initial/End time¶

Define the start and end time of the transient simulation.

Solver type¶

Two different solvers are present. The default solver is lsoda.

Numerical parameters¶

Define the numerical properties of the solver.

Initial Conditions¶

Select between three different modes of initial conditions

Homogenous¶

Define the homogenous temperature acting at the initial time step.

Simulated¶

Select a thermal steady state analysis and the step of this analysis that acts as initial point

Results¶

Select a simulation result from the postprocessor to act as an initial condition. Acceptable simulation result types are steady state and transient thermal results.

Adding transient load data¶

By right-clicking on the transient analysis and by clicking on add load data the time variant load data can be defined. Select the desired load case in the Entity field. This load case has to be defined in advance. There are two ways of importing transient load data. For simple transient load cases the using the table more convenient. For more complex load cases use the import.

Using table¶

Step	Action
1	Click on Table
2	Right-click into newely opened table and click on Copy header
3	Open Excel and paste the header in a new sheet
4	Define the time steps in the Time column
5	Define the values at every time step in the Value column
6	Copy the whole table including the header Time and Value
7	Right-click into the MORe-Table and click on Paste
8	Click on Plot to check if table was copied correctly

Additionally, the number in Number of rows can be changed. This allows to directly define the transient load data in the table.

Important: The headers of the table imported from Excel have to match the ones given in the MORe-Table. Furthermore, tables that have more than 1000 rows can not be copied into MORe.

Using import¶

Step	Action
1	Open matlab and define a vector of name time or var which stores the time steps
2	Define a vector that stores the load data for every time step
3	Select both vectors and save them in a .mat file
4	Right-click on load_case_data and click on Import data
5	Select the .mat file
6	Click on Plot to check if table was copied correctly

Important: In the .mat file there has to be a vector called time or var, otherwise the import will not work.

Start calculation¶

Start the calculation.