# Defining Velocity To Bodies And Geometries In ANSYS® Analyses

Velocity is one of the most important physical phenomena in dynamic analysis. In ANSYS®, you can also define velocities to bodies or geometric features.

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Here, we explain how to define velocities in ANSYS® Mechanical analysis in summary.

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## How To Define Velocity To Parts Or Components In ANSYS® Mechanical?

First of all, velocity can be defined as a boundary condition in FEA analysis in ANSYS®, only in explicit dynamics and transient-structural analyses.

To define velocity, right-click on the analysis component in ANSYS® Mechanical, then hover your mouse on the ‘Insert’ tab. And click on the ‘Velocity’.

Select the bodies or components to define ‘Velocity’ in ANSYS® Mechanical. Then click on the ‘Apply’ button as shown above in the geometry tab.

You can define the velocity with two methods in ANSYS®. One of them is ‘Normal To’ in which you can define the velocity component is directed along to the normal direction from selected geometry.

If you select ‘Components’ you can enter the velocities for each x, y, and z components.

For each component, enter the constant velocities.

Also, you can define velocities with different methods. Click on the little arrow that is shown by the green arrow above. Select the method from this pop-up menu.

• Constant: This is the default option to define your velocity to bodies. Defined velocity is not changing with time in the ‘Constant’ method.
• Free: You can define one component as ‘Free’ with this method that there is no velocity restriction.
• Tabular(Time): You can define each velocity components that are changing with time from ‘Tabular Data’. Just enter time values inside the table and enter corresponding velocities for these times.

You can also adjust step controls to control boundary conditions like velocity more accurately for a given physical system in ANSYS®.

• Function: You can define velocities as a function of ‘time’. As shown in the green box below, the velocity is defined as a function in which the variable is ‘time’. You can see the result in tabular data again.

You can also adjust the equal segmentation of tabular data rows with the ‘Number Of Segments’ option.

## Conclusion

So, the definition of velocities in ANSYS® analyses is very simple and versatile like this.

Do not forget to leave your comments and questions below about the definition of velocities in ANSYS® Mechanical.

NOTE: All the screenshots and images are used for educational and informative purposes. Images used courtesy of ANSYS, Inc.

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