What is the difference beteen “Surface Heat Transfer Coefficient” and “Wall Function Heat Transfer Coefficient” in Fluent?
January 25, 2023 at 7:16 amFAQParticipant
The “Surface Heat Transfer Coefficient” is calculated with “wall temperature”, “total surface heat flux” and a “reference temperature”. This reference temperature is a global value used on all faces. The accuracy of the surface htc (heat transfer coefficient) depends on the accuracy of the simulation and this reference or bulk temperature. For complex geometries it can be next to impossible to set a good reference temperature for large surfaces. Nevertheless, this is the parameter that is used by most Nusselt number correlations. The “Wall Func. Heat Tran. Coef.” depends on the local solution of the flow field in a cell next to a wall. It is completely independent of the surface heat flux. Therefore it exists also for adiabatic walls. Since wall function htc depends on the turbulence model and the local temperature in the cell and at the wall the value has a strong dependency on the mesh resolution. It is quite rare that this parameter is used to judge the results of a simulation. For a mesh with large y+ values and a reasonable reference temperature both parameters have similar results. A study of the differences with some additional explanations is available in solution 2043378.
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
- How can I create a Cell Register from a Cell Zone?
- ANSYS System Coupling: Two Way Fluid Structure Interaction – Part 1
- Delete or Deactivate Zone in Fluent
- Left-handed faces troubleshooting
- Running Python Script from Workbench
- ANSYS Polyflow: Adaptive Meshing Based on Contact
- Check CPU Time in ANSYS FLUENT
- How to overcome the model information incompatible with incoming mesh error?
- Apply Custom Material Properties in Fluent
© 2023 Copyright ANSYS, Inc. All rights reserved.