January 25, 2023 at 7:17 amFAQParticipant
When running a multi-phase transient simulation with cavitation settings turned on, here are some tips to obtain better results and ensure convergence: •Solve the problem as a cavitation problem: use the Rayleigh-Plesset model •The Cavitation Vaporization Coefficient and the Cavitation Rate Under-Relaxation Factor can be used to control the cavitation rate. The Cavitation Rate Under-Relaxation Factor is the fraction of the instantaneous interphase mass transfer rate applied at the current time step. Reducing this factor to 0.1 is usually sufficient to limit vapor formation. •Ensure that the timestep is not overly large, as that may be a source of instability •If cavitation occurs close to an outlet and results in the flow being blocked, then extend the solution domain. Since the flow near an outlet has a large tangential component, the presence of cavitation may result in backflow. Therefore, for extreme cases, the cross-sectional area of the added slip-wall extension can be gradually decreased in order to increase the normal component of the flow to allow it to exit. This can be implemented in the form of an extended downstream section with slip walls. •Change the downstream boundary condition from outlet to opening
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.
- Solver message during DPM calculation: “number of stepsize underflows during particle integration step is x”. What does it mean and how to get rid of it?
- ANSYS Fluent: Efficient Modeling of Spray Breakup using VOF-to-DPM Transition
- ANSYS Fluent: Describing Cavitation in a Centrifugal Pump
- Simulation of Exhaust Gas Recirculation (EGR) Cooler with CFD
- ANSYS Fluent: Lifeboat Launch – Overset & Dynamic Meshes with the Volume of Fluid Model
- Mixing Tank Modeling in ANSYS Fluent
- Optimizing Solid Distribution in Continuous Stirred-Tank Reactor
- ANSYS Fluent: Simulating Multiphase Mixing within a Sparging Tank – Part 1
- Hydrodynamics and Wave Impact Analysis
- Fluent: Simulating Multiphase Mixing within a Sparging Tank – Part 1
© 2023 Copyright ANSYS, Inc. All rights reserved.