February 6, 2023 at 12:40 pmShi KunSubscriber
Hello,everyone. I have encountered some problems and wish to get your help.
1.I use the multiphase Eulerian-Eulerian model, and i want to use the collisional dissipation of energy of ourselves. It can be loaded in Fluent by the form of UDF when partial differential equation of granular temperature Model is used, however, the source term of granular temperature disappear when select the algebraic formulation. I want to know if there exist an interface of collisional dissipation of energy when choice the algebraic formulation.
2.In the UDF, i want to get the gradient of granular temperature, how can i realize it in ansys2023.I have tried the way C_T_G and set in the TUI: solve->set->expert, but there have some trouble.
I really wish to get your reply and thank you in advance.
February 6, 2023 at 3:25 pmRobAnsys Employee
Use the default option for Granular Temperature, the PDE may not be suitable, but that then prevents sources of granular temperature.
The command works if you don't adapt. Where did the mesh come from?
February 7, 2023 at 2:14 amShi KunSubscriber
I am really appreciate for your reply. However, there are still some unclear places.
1.My task is to verify the term of collisional dissipation of energy (the source term of granular temperature) deduced by ourselves. In the start, I use the PDE of granular temperature Model, the interface of granular temperature source can be found in Cell Zone Conditions（As shown in the picture）, but at this time, the calculation is always divergent. So I want to use the Phase property of granular temperature Model to have a try, however, the interface of granular temperature source in Cell Zone Conditions disappear ,and then I don't know where should I add the collisional dissipation of energy (the source term of granular temperature) deduced by ourselves.
2.I need to set initial stacking area in adapt, maybe the mesh of here cause errors. It means if i set initial stacking area in adapt and then i won't get the gradient of granular temperature by the above method? Is there any other way to obtain the gradient of granular temperature？
February 7, 2023 at 10:08 amRobAnsys Employee
The patch option only tends to cause problems if you patch a high volume fraction on/in a fluid jet OR the volume fraction is very near the packing limit.
With your model I think you need to hook that directly into the Granular Temperature as you're replacing the Fluent model.
February 7, 2023 at 12:13 pmShi KunSubscriber
About the packing limit, I'm a little confused. when the number of Eulerian Phases set as 3 and there exist 2 granular phase. How should i give the packing limit of each phase in Fluent? It should be the value of single phase or the value after there mixing or a value greater than 0.63？If the value of packing limit will influence the accuracy of model.
February 7, 2023 at 1:23 pmRobAnsys Employee
The limit is (I think) the sum of the granular phases. But, if you have two sizes then the smaller can fit into the gaps so you might want to increase the value, or start using a UDF to adjust things the limit based on volume fractions.https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v231/en/flu_ug/flu_ug_sec_mphase_using_steps_eulerian.html%23flu_ug_sec_eulermp_using_phases
February 7, 2023 at 1:53 pmShi KunSubscriber
Ok. Thanks for your suggestion. I've got it.
- 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.