CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Running, Solving & CFD

Cahn Hilliard implementation (Biharmonic operator)

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

Reply
 
LinkBack Thread Tools Display Modes
Old   February 15, 2016, 03:36
Default Cahn Hilliard implementation (Biharmonic operator)
  #1
New Member
 
Joe Peterson
Join Date: Feb 2016
Location: Santa Barbara, CA, USA
Posts: 2
Rep Power: 0
jdpeterson3 is on a distinguished road
Hi,

I'm interested in modeling viscoelastic phase separations in simple flows. As a first step in the process, I want to implement a simple diffusive phase separation such as the Cahn Hilliard equation using OpenFOAM.

There are at least several threads with people asking for advice for solving the Cahn Hilliard equation, and as of last active discourse (~2012) there was no publicly distributed resolution to the main problem (an implicit treatment of the fourth order derivative in the problem)

A link to one of the prior threads on this topic:
http://www.cfd-online.com/Forums/ope...-openfoam.html

The grand challenge is that, for a stable implementation, a fourth order spatial derivative (the biharmonic operator) must be calculated implicitly at some stage. One common way to accomplish this is to solve simultaneously for two variables such that the model assumes the following structure:

x = laplacian(y)
dx/dt = laplacian(x + y)

I'm new to the environment, but so far it seems that in OpenFOAM the solver only solves a single field at a time; can I trick it into solving for these two variables simultaneously? Is there another way that I should be thinking about the problem?

Any help or insight into this challenge would be greatly appreciated!
jdpeterson3 is offline   Reply With Quote

Reply

Tags
biharmonic, cahn hilliard, phase field, phase separations

Thread Tools
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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
ANSYS Workbench on "Uncertified" Linux Distros hsr CFX 262 September 7, 2016 21:05
Create a biharmonic operator Pascal_doran OpenFOAM Programming & Development 12 May 22, 2016 06:02
FLUENT installation on UBUNTU 12.04 (LTS) teymourj FLUENT 0 August 26, 2013 20:27
cahn hilliard equation finite volume method dvdromnu OpenFOAM Programming & Development 0 December 14, 2009 03:09
Cahn Hilliard couple with Navier Stokes Khan Main CFD Forum 0 September 2, 2006 02:19


All times are GMT -4. The time now is 15:37.