Tagged: 16, fluid-dynamics, General, polyflow
March 17, 2023 at 8:58 amFAQParticipant
When defining a simulation involving contact, POLYDATA informs the user that the prediction on the velocity field is disabled. What does it mean actually? For solving a transient simulation, a predictor-corrector time marching scheme is used. In such a scheme, the predictor is a first guess of the solution at the next time step (n+1) and is usually obtained by extrapolating the unknown fields from past time, the corrector is the actual solution at that step (n+1) resulting from the non-linear solver. The deviation between predictor and corrector is a measure of the accuracy and is used for selecting subsequent time steps. In simulations involving contact, this procedure cannot be applied for the velocity field. Indeed, at a contact occurrence, the velocity is suddenly assigned another value controlled by the contact parameters e.g. it jumps down to zero at the contact occurrence with a fixed mold. In such a circumstance, the predictor-corrector scheme would fail since the velocity would apparently exhibit a high inaccuracy. In order to circumvent this, the velocity is simply removed from the list of fields used for the accuracy evaluation. The predictor is not evaluated (or the prediction on the velocity field is disabled). However, the velocity field is kept for the evaluation of convergence. In most contact simulations, the prediction of the velocity field is disabled (as explained above). The accuracy of the transient scheme is evaluated on the basis of other fields.
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.
- ANSYS Fluent: Introduction to the GEKO Turbulence Model Part I
- ANSYS System Coupling: Two Way Fluid Structure Interaction – Part 1
- Delete or Deactivate Zone in Fluent
- ANSYS Polyflow: Adaptive Meshing Based on Contact
- Apply Custom Material Properties in Fluent
- What is meant by Warning: Flow boundary zone 18 is adjacent to a solid zone?
- Aero-Mechanical Simulation of Turbomachinery Blading
- Check CPU Time in ANSYS FLUENT
- Running Python Script from Workbench
- How can I create a Cell Register from a Cell Zone?
© 2023 Copyright ANSYS, Inc. All rights reserved.