CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Programming & Development

Wall deposition of scalar quantities - BC treatment and general modelling

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 9, 2020, 11:11
Default Wall deposition of scalar quantities - BC treatment and general modelling
  #1
Member
 
Andrea Di Ronco
Join Date: Nov 2016
Location: Milano, Italy
Posts: 30
Rep Power: 5
Diro7 is on a distinguished road
Hello!

I'm working on transport and deposition of scalar quantities.
At the moment the approach is very simplified (incompressible, single-phase, single-region).

Before starting to tweak existing things my way, it would be great to hear some opinions.
Let me share some personal thoughts first, as a starting point:

1) What I need is first of all some physical models to implement boundary conditions, i.e. a way to express the flux of the transported quantities from the liquid domain to the walls.
I've found that in many works "perfectly absorbing walls" are assumed (i.e. 0 concentration at the walls), which can work as a starting point but if someone knows some CFD-oriented work which deals with this kind of problems in more detail it could be very useful to me.

2) Once I know how to compute gradients at the walls, the job is done from the liquid viewpoint. What is left is how to model the accumulation of deposited quantities on the walls. In my perspective, deposited quantities stick to the walls and cannot be released in any way, but can undergo some decay process. Therefore I need to keep track of deposited quantities, and have them evolve as though they are subject to some differential equation.

The wall is simply a boundary, so I'm not sure on how to deal with this problem using standard fvPatchFields and usual OF stuff. I've noticed that the ESI version implements some kind of Finite Area Method, that is something which may be related to my problem but I'm not familiar with (also, I'm working with the Foundation version).

Other approaches may include the definition of some auxiliary variable fields to store and evolve deposited quantities, but I didn't try this approach yet.

Does anyone have previous experience, or any kind of comment of suggestion?
Thank you in advance, any contribution would be greatly appreciated.

Andrea
Diro7 is offline   Reply With Quote

Reply

Tags
boundary condition, deposition, finite area method

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Near wall treatment in k-omega SST Arnoldinho OpenFOAM Running, Solving & CFD 38 March 8, 2017 13:48


All times are GMT -4. The time now is 20:32.