Modeling & Meshing

Modeling & Meshing

  1. All Categories
  2. Structures - Modeling & Meshing
  3. Is any mass associated with the in-plane rotational DOF for SHELL181?

Is any mass associated with the in-plane rotational DOF for SHELL181?

Tagged: 17, beams-and-shells, mechanical-apdl, modeling-and-meshing, structural-dynamics, structural-mechanics
    • March 17, 2023 at 9:00 am
      FAQFAQ
      Participant

      No, the mass associated with the in-plane rotational DOF (ROTZ) is set to zero. SHELL181 does not have physical stiffness for the in-plane rotational DOF (i.e., drilling DOF). To deal with arbitrarily oriented shells, a small drilling stiffness is used. However, the stiffness is very small, so any mass associated with the drilling DOF could produce spurious modes (SQRT(k/m)). Therefore, ANSYS removes the mass associated with the in-plane rotational DOF.

Featured Articles

Introducing Ansys Electronics Desktop on Ansys Cloud

The Watch & Learn video article provides an overview of cloud computing from Electronics Desktop and details the product licenses and subscriptions to ANSYS Cloud Service that are...

How to Create a Reflector for a Center High-Mounted Stop Lamp (CHMSL)

This video article demonstrates how to create a reflector for a center high-mounted stop lamp. Optical Part design in Ansys SPEOS enables the design and validation of multiple...

Introducing the GEKO Turbulence Model in Ansys Fluent

The GEKO (GEneralized K-Omega) turbulence model offers a flexible, robust, general-purpose approach to RANS turbulence modeling. Introducing 2 videos: Part 1 provides background information on the model and a...

Postprocessing on Ansys EnSight

This video demonstrates exporting data from Fluent in EnSight Case Gold format, and it reviews the basic postprocessing capabilities of EnSight.

© 2025 Copyright ANSYS, Inc. All rights reserved.