April 14, 2022 at 8:43 amprebenjsSubscriber
What does the Smoothed VOF gradient really show. I read the the guides but couldn't really get a good grasp of what it really is. Is it a good measure on interfacial diffusion between phases ?April 14, 2022 at 8:34 pmKRAdministratorHello:
Please review this link.
37.4. Alphabetical Listing of Field Variables and Their Definitions (ansys.com)
April 15, 2022 at 7:15 amprebenjsSubscriberI've read this, but as mentioned It would be nice with some more explanation about what this really measures, in a more "practical" way.
April 15, 2022 at 11:26 amaitor.amatriainSubscriberThe smoothing process is based on the volumetric average over the cell neighbors
43.14.2. Patch Dialog Box (ansys.com)
It is essentially a simple filter.
April 16, 2022 at 9:37 amprebenjsSubscriberYes, but what does the quantity of the smoothed VOF gradient really tell you ? Is this a measure that can be related to the interfacial diffusion between phases ?
April 16, 2022 at 4:15 pmaitor.amatriainSubscriberI guess that it could be useful for post-processing in the case of coarse meshes.
The phase continuity equation does not have any diffusion term, so all values that are not 0 or 1 are essentially caused by numerical diffusion.
April 17, 2022 at 10:24 amprebenjsSubscriberMaybe. But the meaning of the term Smoothed VOF gradient, do you have any easy explanation here. I guess one can say that it could be seen as a blending of volume fraction due to discontinuities or to allow mass balance in steep gradient areas, where blending is used as a tool to avoid discontinuities in the numerical values.
Do you agree with this representation of the smoothed vof gradient ?
April 18, 2022 at 2:41 pmDrAmineAnsys EmployeeQuantity used for curvature calculation and surface tension force.
April 18, 2022 at 2:42 pmDrAmineAnsys EmployeeAnd one can use it or smooth vof field to add some smoothness when dealing with phase change which relies on interfacial area.
April 19, 2022 at 11:26 amprebenjsSubscriberOkay, So generally it will say something about the numerical diffusion between the phases caused by surface tension forces ? I don't get what you mean by your last comment.
May 14, 2022 at 8:36 amprebenjsSubscriber?
Viewing 10 reply threads
Ansys Innovation Space
- The topic ‘Smoothed VOF gradient’ is closed to new replies.
Boost Ansys Fluent Simulations with AWS
Computational Fluid Dynamics (CFD) helps engineers design products in which the flow of fluid components is a significant challenge. These different use cases often require large complex models to solve on a traditional workstation. Click here to join this event to learn how to leverage Ansys Fluids on the cloud, thanks to Ansys Gateway powered by AWS.
Earth Rescue – An Ansys Online Series
The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.
Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.Trending discussions
- legend min and max
- Ensight hot iron palette from an image
- Streamlines in EnSight using MRI data
- Import MRI data into Ensight
- FLUENT APPLICATIION ERROR
- Total Surface Heat Flux Calculation in Fluent
- Difference between “total pressure” and “absolute pressure”?
- Drop Test of a Water-Filled Tube
- Minimum Orthogonal Quality Less than 0.01 For Transonic Airfoil Flow Analysis
- obtaining pressure distribution by making points in ansys
Top Rated Tags
© 2023 Copyright ANSYS, Inc. All rights reserved.Ansys does not support the usage of unauthorized Ansys software. Please visit www.ansys.com to obtain an official distribution.