May 19, 2021 at 8:28 amsripadarajakSubscriber
It is said that when Reynold's number is much lesser than 1 then convective terms can be removed/neglected. Simulations involving capillary flow where Re << 1, is computation is done with convective terms being removed or neglected?May 19, 2021 at 9:41 amDrAmineAnsys EmployeeFluent is general purpose CFD Code: we are solving all parts and we are not neglecting anything based on Reynolds Number. Convective terms are always solved for and discretized. If you want to avoid that: use UDS and UDF's.
May 19, 2021 at 10:05 amsripadarajakSubscriber- Thank you for your quick reply. Typically, when we linearize the PDE's second order terms are neglected. So, when you say convective terms are not neglected, then computation is done without linearizing the basic PDEs (N-S equations) ?
May 19, 2021 at 10:59 amDrAmineAnsys EmployeeI am not saying that: we are linearizing the PDE's and we end up with general formula a_p*phi_p= Sum of a_neighbour*phi_neigbour + Source. Please consult the Fluent Theory Guide and any Text Book on Numerical Methods.
May 20, 2021 at 7:58 amaitor.amatriainSubscriberthe topic of linearizing PDEs is very broad. You can linearize many things: the original PDE, a perturbated PDE, the original PDE is weak form, the discretized PDE...
Convective terms can be neglected when Re<<1, but I see no advantage of doing that; indeed, in a flow where viscous terms are dominant one does not expect numerical problems. In the opposite case (Re>>1) , the story is totally different.
Viewing 4 reply threads
Ansys Innovation Space
- You must be logged in to reply to this topic.
Simulation World 2022
Check out more than 70 different sessions now available on demand. Get inspired as you hear from visionary companies, leading researchers and educators from around the globe on a variety of topics from life-saving improvements in healthcare, to bold new realities of space travel. Take a leap of certainty and check out a session today here.
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
- Suppress Fluent to open with GUI while performing in journal file
- Heat transfer coefficient
- What are the differences between CFX and Fluent?
- Floating point exception in Fluent
- The solver failed with a non-zero exit code of : 2
- Getting graph and tabular data from result in workbench mechanical
- Difference between K-epsilon and K-omega Turbulence Model
- Time Step Size and Courant Number
- Mesh Interfaces in ANSYS FLUENT
- error in cfd post
Top Rated Tags
© 2022 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.