|
[Sponsors] |
pressure neumann boundary condition for invicid flow around moving boundaries |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
April 17, 2022, 21:51 |
pressure neumann boundary condition for invicid flow around moving boundaries
|
#1 |
Member
Anders Aamodt Resell
Join Date: Dec 2021
Location: Oslo, Norway
Posts: 66
Rep Power: 4 |
Hi
I'm struggling to understand how a a correct neumann bc for the pressure is supposed to be derived when the Euler equations are used, and moving boundaries are permitted. The impermeability condition reads , where is the flow velocity, is the velocity of the solid boundary, and is the normal vector pointing out of the solid domain. The momentum equation projected in the normal direction gives , so the challenge is to find . I've seen a paper with the name of "A high order moving boundary treatment for compressible inviscid flows" take the material derivative of the impermeability condition stated above, which by application of the product rule gives . A source of confusion in the mentioned paper was that the term was written as . I guess my primary issue is to find out how the material derivative of the normal velocity and the term are computed. I'm confused on whether for instance the material normal vector should be "advected with the flow" or if it's described relative to the solid body. In the case of a curved, static boundary would yield a nonzero term for a nonzero tangential velocity, while would yield zero anyway, if I'm not mistaken. If someone could explain or possibly point me to a nice source on the topic, it would be greatly appreciated. |
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Question about different kinds of Boundaries and Boundary Conditions | granzer | Main CFD Forum | 17 | April 12, 2022 18:27 |
JOB ABORT invoked by rank 17 | ltl | CONVERGE | 3 | January 25, 2021 16:05 |
Match Pressure Inlet/Outlet Boundary Condition Mass Flow Rate | MSchneid | Fluent UDF and Scheme Programming | 3 | February 23, 2019 07:00 |
Problem with SIMPLEC-like finite volume channel flow boundary conditions | ghobold | Main CFD Forum | 3 | June 15, 2015 12:14 |
An error has occurred in cfx5solve: | volo87 | CFX | 5 | June 14, 2013 18:44 |