January 25, 2023 at 7:17 amFAQParticipant
For details and an example see also Tutorial 16 “Reacting Flow in a Mixing Tube” of ANSYS CFX. https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v195/cfx_tutr/cfxReacDefiForm.html A source S is fully specified by an expression for its value . A source coefficient C is optional, but can be specified to provide convergence enhancement or stability for strongly-varying sources. The value of C may affect the rate of convergence but will not affect the converged results. If no suitable value is available for C, the solution time scale or time step can still be reduced to help improve convergence of difficult source terms. Important: C must never be positive. (If a positive C is specified, CFX will automatically change it to be negative so that the calculation remains stable.) An optimal value for C when solving an individual equation for a positive variable Phi with a source S whose strength decreases with increasing Phi is C = d S / d Phi Where this derivative cannot be computed easily, C = S / Phi may be sufficient to ensure convergence. Another useful formula for C is C = -rho / tau where tau is a local estimate for the source time scale. Provided that the source time scale is not excessively small compared to flow or mixing time scales, this may be a useful approach for controlling sources with positive feedback ( d S / d Phi > 0) or sources that do not depend directly on the solved variable Phi.
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.
- I am running an electrochemistry simulation in Fluent. How can I access the electrochemistry reaction rates with UDF?
- How do I model humidity in Fluent?
- ANSYS Internal Combustion Engine (ICE): Port Flow Part 1 – Getting Started
- LES Simulation of Turbulent Flames Using ANSYS Fluent
- How can volume fraction be plotted in a species transport simulation?
- ANSYS Fluent: Describing Non-premixed Combustion using the Steady Flamelet Model
- What is a DASAC failure and how can I correct it?
- Error “…Cannot find thermo database file …Reverting to default…” while reading PDF Table. How to link a specific thermodynamic database file to a case?
- ANSYS Internal Combustion Engine (ICE): Engine Sector Combustion Part 6 Results
- ANSYS Internal Combustion Engine: (ICE) Engine Sector Combustion Part 1 Getting Started