# Defining Rotational Velocity To A Body In ANSYS® Mechanical(Illustrated Expression)

In dynamic analyses ANSYS® Mechanical, the definition of physical conditions in a very good way is a very important thing like meshing. Because these physical definitions will be boundary conditions in Finite Element Analyses in ANSYS®. In this article, we will show you how to define rotational velocity to a body in ANSYS® Mechanical.

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## How To Define Rotational Velocity In ANSYS® Mechanical?

If you want to add rotational velocity to a part or component in ANSYS® Mechanical, click on the analysis tab shown by the red arrow above which is ‘Static Structural’ here, then click ‘Insert’ in the red box above. There will be a list opened, click on ‘Rotational Velocity’ as shown by the green arrow.

After clicking on ‘Rotational Velocity’ in ANSYS® Mechanical, select your components and bodies that will be rotated as in the green box. You just need to select bodies and parts, then click on the ‘Apply’ button on ‘Geometry’. There are two option to define rotational velocity to selected components in ANSYS® Mechanical;

• Vector: As you see above, you need to select an axis of rotation from geometry or coordinate systems as shown by the blue arrow above. Then you need to select the direction of rotation as shown in the blue box above. The direction of rotation will be changed if you click on that ‘Arrow icon’. And click on ‘Apply’ at ‘Axis’. Enter your rotational velocity ‘Magnitude’ as shown in the red box.
• Components: You can define your axis of rotation as components if you select ‘Define By’ as ‘Components’ as shown by the green arrow above. Then you need to enter X, Y, and Z magnitudes of rotational velocity as shown by the green box. Then you need to select the place of the axis by entering X, Y, and Z components again as shown in the red box. The resultant is shown by the yellow arrow in ANSYS® Mechanical.

## Conclusion

Definition of rotational velocity in ANSYS® Mechanical is very easy like above. Do not forget to leave your comments and questions below about the definition of ‘Rotational Velocity’ in ANSYS® Mechanical!

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

### 4 Comments

1. SP says:

Why we are adding rotational velocity? And How rotational velocity will add effect in linear static analysis?

1. MB-Editor says:

If you define a constant rotational velocity, the effects of this constant rpm will be a steady-state force. Think about that you are assingning constant force.

2. MOHIT says:

I have provided angular velocity in explicit dynamics but still my tool is not rotating and I am not able to drill, if you have any drilling file. Please share the simulations step with me as I am in trouble. I hope you will help.

1. MB-Editor says:

In explicit dynamics, you must the analysis steps in a very wise way. I strongly recommend you to take a look explicit dynamics analyses examples in YouTube.

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