Setting the Unit System for Models
Setting the Unit System on the Global Level
To set the unit system for the entire MPH-file on a global level:
1
In the Model Builder, click the root node (the top node in the model tree). The root node’s name is the name of the MPH-file or Untitled.mph before you have saved your work.
2
In the root node’s Settings window, select the unit system from the list in the Unit System section or None to turn off unit support.
Setting the Unit System for Individual Model Components
By default, all components in a model use the same global unit system, but it is possible to use different unit systems in each component. To do so, follow these steps:
1
In the Model Builder, click the top node for a Component branch (Component 1, for example).
2
In the Settings window for a Component node locate the Units section.
3
From the Unit system list, select the unit system from the list in the Units section or choose None to turn off unit support (default: Same as global system, with the global unit system added in parentheses).
To make the results of a model independent of the unit system, make sure to define all material properties and other model settings using unit syntax so that all values are interpreted using the intended units. If you switch from a metric unit system, using kelvin as the temperature unit, to a unit system using degrees Fahrenheit as the temperature, or vice versa, the model results are typically not identical because of the offset involved in the conversion of temperature values.
To disable unit support in a model, choose None from the list in the Unit System section in the root node’s Settings window and make sure that the corresponding setting for each component is Same as global system. If unit support is turned off only for some components (or if the settings at global and component level differ for a model with a single component) unexpected side effects can occur.
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Using Units
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The Root Settings Window