March 17, 2023 at 1:11 pmFAQParticipant
Besides the tips in solution#2000941 there are some further recommendations: Since Fluent 15, the default cycle-type in the AMG-settings for energy is F-cycle. This can improve the convergence, as shown in the attached slide 1. This is true especially for cases where diffusion is the predominant effect and for cases with high jump in thermal conductivity. However, for other cases this new default could lead to instabilities/crash. In such cases it is recommended to use the old default, which was Flexible cycle. Use Least-Square Cell-Based gradient-reconstruction method, when solving energy equation. See slides 2-4. Maybe the instability comes from ideal gas. Try to start w/o ideal gas and also w/o energy equation. Run a few iterations and then enable ideal gas. Monitor max and min values of temperature in the volume. If limiters are hit, inspect these cells by means of adapt/iso-value. If a bad mesh causes the issues, mark these cells (mark instead of adapt) and in TUI: solve/set/poor-mesh-numerics/user-defined-on-register yes, followed by the name or ID of the register. This will apply poor-mesh-numerics on these cells, even if the quality is ok.
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.
- Simulating Battery Pack Cooling System Using Ansys Fluent
- Thermal Analysis of a Radiator Using Ansys Fluent
- ANSYS Fluent Student: Conjugate Heat Transfer in a Heat Sink
- How do I determine if I must consider natural or forced convection?
- What are the TUI commands to enable / disable Shell Conduction?
- How much number of faces per cluster value should be used for S2S radiation model in ANSYS Fluent?
- ANSYS Fluent: Overview of the Mapped Interface Technique for CHT Simulations (18.2)
- Plate Heat Exchanger Solver Setup in ANSYS Student – Part 1
- Tips for resolving unphysical temperatures and poor convergence with CHT cases.
- ANSYS Fluent: Heat transfer in a Shell and Tube Heat Exchanger – Part 1
© 2023 Copyright ANSYS, Inc. All rights reserved.