August 16, 2022 at 9:27 amshitizsehgalSubscriber
I am sorry if this post is shown twice on your feed. My question is about correctly accounting the energy source term in a VOF simulation. My query is as follows:
- When using a UDF (DEFINE_SOURCE) for prescribing energy source, is it mandatory to select /solve/set/multiphase-numerics/heat-mass-transfer/alternative-energy-source-treatment? to yes ( or can it stay to the default value of [no]). Please help me understand the purpose of this command line or the alternative treatment.
- I have latent heat value with me, which is 2706.2 kj/kg. Now should I prescribe it in the material properties of the vapor phase by converting it to kmol units there? I am guessing not, because I am using DEFINE_SOURCE to precribe the energy source. So, in that case
- what would be the appropriate units for latent heat in the UDF (kj/kg) or something else? I am currently using J/kg because that coupled with other terms (mass source term) gives me W/m^3 as the units for the energy source. I just want to be sure about what I am doing.
- Also, what should i prescribe in the material properties for standard state enthalpy of vapor? (0?)
August 16, 2022 at 2:34 pmRobAnsys Employee
Source terms are assigned to the CELL ZONE, and are mass/heat/momentum etc per unit volume, so some care is needed to make sure you add the correct amount of material.
No need to alter the alternative treatment, as to what it does, check the manual https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v221/en/flu_ug/flu_ug_sec_mphase_massxfr.html%23flu_ug_sec_mphase_massxfr_altern_e
August 18, 2022 at 6:09 pmshitizsehgalSubscriber
Thanks for your response, but the link that you shared requires me to register as a customer. I am not able to access the information beyond the registration.
Also, I am still not sure about the units of latent heat in DEFINE_SOURCE. Is it going to be in kj/kg or j/kg or something else? Can you please clarify?
August 19, 2022 at 3:16 pmRobAnsys Employee
Click on Help in the solver, when the browser opens copy the link into another tab.
The source term is for energy, it's for you to work out how much to add. If you're modelling phase change you may want to look at the Fluent multiphase models.
August 29, 2022 at 12:50 pmDrAmineAnsys Employee
Energy source term to be provided in W/m³.
- 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.
- Suppress Fluent to open with GUI while performing in journal file
- Floating point exception in Fluent
- What are the differences between CFX and Fluent?
- Heat transfer coefficient
- Getting graph and tabular data from result in workbench mechanical
- Difference between K-epsilon and K-omega Turbulence Model
- The solver failed with a non-zero exit code of : 2
- Time Step Size and Courant Number
- Mesh Interfaces in ANSYS FLUENT
- error: Received signal SIGSEGV
© 2023 Copyright ANSYS, Inc. All rights reserved.