Assigning Source Properties
A source is a modeling boundary condition that represents a region in the model within which heat flux originates. Source geometries include rectangular, circular, 2D polygon, cylinder, and CAD. Sources can be used to specify the primary field variable of temperature. Sources can exchange radiation with other objects in the model.
Note:
Use the navigation arrows on the image below to view each tab.
| General | |
| Name |
The Name of the source appears in the Project Manager window and 3D Modeler window. |
| General: Thermal Specification | |
| Thermal Condition: Total Power |
Total Power specifies the total power output over the plane of the source. If needed, select the check box and select Temp Dep to specify the temperature dependence of power. For transient simulations, select Transient, to specify power as a function of time. |
| Thermal Condition: Surface Flux | Surface Flux specifies the flux of heat per unit area of the source for a 2D source. If needed, select the check box and select Temp Dep to specify the temperature dependence of surface flux. For transient simulations, select Transient, to specify surface flux as a function of time. |
| Thermal Condition: Fixed Temperature | Fixed Temperature allows you to specify the temperature of the source. By default, the temperature is the Temperature specified in the Icepak Design Settings dialog box. For transient simulations, select Transient, to specify temperature as a function of time. |
| Thermal Condition: DTM |
DTM allows you to use the Dynamic Thermal Modeling feature for transient simulations. You can assign DTM to 2D source geometry. Dynamic Thermal Modeling allows you to specify a temperature-dependent power after each time step of a transient simulation. |
| Radiation |
Radiation enables the specification of radiation as an active mode of heat transfer to and from the source. |
| General: Voltage/Current Specification | |
| Voltage/Current | Voltage/Current allows you to specify a voltage or current for the source. Select Current or Voltage and enter the appropriate value. For steady-state simulations, if needed, select the check box and select Temp Dep. For Temp Dep, click Edit to specify the temperature dependence of voltage or current. For transient simulations, select Temp Dep, Transient, or DTM. Transient allows you to specify voltage or current as a function of time. DTM (dynamic thermal modeling) allows you to specify a temperature-dependent voltage or current after each time step of a transient simulation. |
| Radiation | |
| Surface Material | Surface Material specifies the material type for the side of the plate using the Select Definition dialog box. |
| Radiate To | Select All Objects or Reference Temperature. All Objects specifies that the object or surface exchanges radiation with all other objects and surfaces also specified as subject to radiation with heat transfer. Reference temperature specifies a fixed temperature to which the selected sides of the object radiate heat. Enter a Temperature and View factor, which is the proportion of radiation that leaves the plate and contacts surrounding objects. The default view factor is 1.0 and the value of the ambient temperature is the Temperature specified in the Icepak Design Settings dialog box. |
Note:
- If needed, you can enter a temperature dependent expression for Total Power and Surface Flux. See Temperature Dependent Thermal Properties for more information. For more information about specifying temperature-dependent power, see Using Datasets to Define Temperature Dependent Parameters.
- For more information on specifying transient parameters, see Specifying Parameters as a Function of Time.
- For more information on dynamic thermal modeling, see DTM - Thermostat for Source Control.
- If needed, you can define Surface Flux as a spatial, or volumetric, profile using an expression and a 3D dataset. See Adding 3D Datasets for more information.
Assigning a Source and Defining Thermal Properties
To assign a source boundary condition and define its properties:
Note:
When selecting geometry in the 3D Modeler, ensure the appropriate selection mode is enabled.
- For two-dimensional geometry, press F to enable face-selection mode.
- For three-dimensional geometry, press O to enable object-selection mode.
- Select and right-click a geometry component in the 3D Modeler window or the history tree.
- From the right-click menu, select Assign Thermal>Source.
- On the General tab, enter a Name for the source.
- Under Thermal Specification, select a Thermal Condition. Do one of the following:
- If you selected Total Power,enter the Total Power.
- If you selected Surface Flux, enter the Surface Heat.
- If you selected Fixed Temperature, enter the Temperature.
- If you selected DTM, ensure you specify the dynamic thermal modeling control program script in the Icepak Solve Setup dialog. To create the script file, use the Thermostat for Source Control toolkit.
- If needed, select Radiation.
- If needed, enable Voltage/Current, select Current or Voltage, and enter a value. For steady-state simulations, if needed, enable the check box and select Temp Dep. For transient simulations, if needed, enable the check box and select Transient or DTM. Define a variation function for Temp Dep or Transient.
- Do one of the following:
- If you did not select theRadiation check box, click OK.
- If you selected Radiation, click the Radiation tab.
- In the next dialog box next to Surface Material, click vacuum to open the Select Definition dialog box. On the Materials tab, select the material for the side of the plate and click OK.
- For Radiate To, click All Objects or Reference Temperature.
- If you selected Reference Temperature, enter a Temperature and View Factor.
- Click OK.
Note:
The boundary condition dialog has a Defaults tab, which contains information related to default settings for the boundary condition properties and the following buttons:
- Save Defaults saves the currently defined properties as the default for newly created boundary conditions.
- Revert to Standard Defaults sets the boundary condition properties to the saved default values.
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Click here for scripting information related to this feature. |