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

pimpleFOAM/icoFOAM,Problem of convergence while simulating oscillatory flow condition

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

Like Tree1Likes
  • 1 Post By luther1990

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   January 29, 2018, 15:05
Default pimpleFOAM/icoFOAM,Problem of convergence while simulating oscillatory flow condition
  #1
Member
 
Join Date: Apr 2016
Posts: 30
Rep Power: 8
shanvach is on a distinguished road
Hi all,

I have been trying to simulate a laminar oscillatory flow condition (eg breathing,blood pumping) using icoFOAM/pimpleFOAM.However the solution is not converging for either of the two solvers. The mesh has been used before for a similar simulation therefore the mesh does not seem to be the problem.Your valuable inputs for this problem is greatly appreciated. Given are the boundary conditions for the velocity,pressure and solution controls.
Also nNonOrthogonalCorrectors=2

Boundary Conditions for velocity

dimensions [0 1 -1 0 0 0 0];

internalField uniform (0 0 0);

boundaryField
{
WALL
{
type noSlip;
}

INLET
{
type uniformFixedValue;
uniformValue
{
type sine;
frequency 0.2;
amplitude .5;
scale (0 0 1);
level (0 0 0);
}
}

OUTLETS
{
type zeroGradient;
}

}
Boundary Conditions for Pressure

dimensions [0 2 -2 0 0 0 0];

internalField uniform 0;

boundaryField
{
WALL
{
type fixedValue;
value uniform .01;
}

INLET
{
type zeroGradient;
}

OUTLETS
{
type fixedValue;
value uniform 0;
}

}

Control Dict

application icoFoam;

startFrom latestTime;

startTime 0;

stopAt endTime;

endTime .006;

deltaT 0.0005;

writeControl timeStep;

writeInterval 20;

purgeWrite 0;

writeFormat ascii;

writePrecision 6;

writeCompression off;

timeFormat general;

timePrecision 6;

runTimeModifiable true;
shanvach is offline   Reply With Quote

Old   January 29, 2018, 22:39
Default
  #2
New Member
 
Yuncheng Xu (Cloud)
Join Date: May 2011
Location: State College, PA
Posts: 20
Rep Power: 13
luther1990 is on a distinguished road
try zero gradient pressure on wall
shanvach likes this.
luther1990 is offline   Reply With Quote

Old   July 13, 2018, 09:13
Default Convergence
  #3
Member
 
Ben 017
Join Date: Nov 2017
Posts: 70
Rep Power: 6
Ben UWIHANGANYE is on a distinguished road
Hello

I would like to ask about convergence of a simulation in foam ext 4.0
Indeed, i am running a tutorial of immersed boundary(movingcylinderInchannel), using IcoDyMIbFOAM,
I would like to ask about its convergence?
You may refer to the attached picture of residuals!
Regard!
Attached Images
File Type: png Uresiduals.png (41.6 KB, 10 views)
Ben UWIHANGANYE is offline   Reply With Quote

Reply

Tags
convergence, icofoam, oscillatory flow, pimplefoam, variable bc

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
boundary condition with pressure AND mass flow rate tsi07 FLUENT 3 April 14, 2022 12:32
Convergence with SIMPLE algorithm simulating water flow in a valve enginpower Main CFD Forum 2 August 25, 2017 06:24
Mass flow rate boundary condition with negative values hebe2u. CFX 1 December 27, 2016 03:53
Simulating a Laminar Isothermal Flow in a 2D rectangular Channel HectorRedal Main CFD Forum 1 December 18, 2016 11:41
Convergence problem with target mass flow rate ADL FLUENT 2 May 29, 2012 21:11


All times are GMT -4. The time now is 01:49.