April 28, 2022 at 3:56 pmaxt5488SubscriberMay 4, 2022 at 8:35 pmMay 5, 2022 at 7:07 amDrAmineAnsys EmployeeMoving Heat Source: You can create an Expression to mimic a moving heat source which will change where it applies on time. If you know how the source will move then it should be simple. (Alternative is to use UDF).
Can you just show the VOF field without showing the grid. How many cell zones do you have?
May 5, 2022 at 1:41 pmaxt5488SubscriberThank you Dr Amine
VOF model is not on in this simulation. This is the image that I have when I plot the contour for liquid fraction after running only Solidification & Melting with Energy 'on'. Also the heat source is not moving just defined the heat flux in Cell Zone and Wall to see and understand the solidification and melting basics. I start with very basic to understand the melting simulation since there is only one case in ansys fluent tutorial and the parameters in that case are not fully explained. I do not know why the image is look like this (grid). Interior air always liquid fraction 1.0 in every case but there is no liquid fraction in Aluminum side.
May 5, 2022 at 6:07 pmDrAmineAnsys EmployeeDo you have air and "fluid" aluminum in the same cell zone? Add screenshots of all important panels of your case, please.
May 5, 2022 at 7:47 pmaxt5488SubscriberHello Dr Amine Here you can see
When I try to plot liquid fraction:
The result is like
When I check the temperature distribution if it exceeds melting (1150K) then the thermal gradient looks like this
When I run the simulation with VOF model on:
Properties of Liquid Aluminum
Cell Zone Condition Energy source defined as constant heat flux for pb_left and pb_right these regions can be distinguished in the temperature contour with color gradient
Boundary condition for pb_left and pb_right the other boundaries constant at 300K
Time step size defined as 0.1 which is smaller then the courant number (0.25)
Liquid volume fraction is like
when I change the surface tension coefficient from -0.0036 (this value given in the ansys tutorial for marangoni stress) to 0 result does not change
If you need further info please let me know. I guess I need to clarify the definitions for fluid and solid region. For melting metal I defined as liquid aluminum. Do I need to define melting region in two groups as fluid and solid or how can I do that
May 6, 2022 at 4:05 pmRobForum ModeratorIs it supposed to be one fluid zone? If so there are a lot of walls. How many fluid zones are there, and what are the boundaries between them?
May 6, 2022 at 4:18 pmMay 6, 2022 at 7:30 pmDrAmineAnsys EmployeeYou said you do not have multiphase and now I see VOF.
The mass transfer between phases is wrong: u do not require that.
May 6, 2022 at 8:03 pmMay 9, 2022 at 12:36 pmRobForum ModeratorAnd you have walls between the air and melting fluid? If so the liquid/solid fraction in the air space may return an odd value so check any liquidus/solidus temperatures in that zone: it may return as all liquid due to the model definitions.
May 12, 2022 at 4:19 pmMay 13, 2022 at 10:02 amRobForum ModeratorWhat did you do to those walls? Ie please confirm they're still coupled.
May 16, 2022 at 4:46 pmaxt5488SubscriberWalls used to define heat transfer conditions between the regions.
I think the problem is the definition of the cell zone condition when it is defined as fluid the volume fraction of the interior resulted as 1.0 if it is defined as solid then result was 0.0. Is there a way to define the cell zone condition as mixture?
May 17, 2022 at 9:50 amRobForum ModeratorIf the cell zone is fluid it'll need to be assigned as the correct material. If the metal and air are separate you don't need a multiphase model, and then set the two fluid zones as air & molten metal.
Viewing 14 reply threads
Ansys Innovation Space
- You must be logged in to reply to this topic.
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
- Floating point exception in Fluent
- What are the differences between CFX and Fluent?
- Heat transfer coefficient
- Difference between K-epsilon and K-omega Turbulence Model
- Getting graph and tabular data from result in workbench mechanical
- The solver failed with a non-zero exit code of : 2
- Time Step Size and Courant Number
- Mesh Interfaces in ANSYS FLUENT
- Suppress Fluent to open with GUI while performing in journal file
- error: Received signal SIGSEGV
© 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.