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

comparison of discontinuity capturing by different solvers

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

Reply
 
LinkBack Thread Tools Display Modes
Old   May 17, 2013, 01:51
Default comparison of discontinuity capturing by different solvers
  #1
Senior Member
 
immortality's Avatar
 
Ehsan
Join Date: Oct 2012
Location: Iran
Posts: 2,205
Rep Power: 17
immortality is on a distinguished road
hi
I know analytical solutions are there for inviscid one dimensional laminar and constant properties problems of shock tube.
But i want to validate and examine which compressible solver(sonicFoam,rhoCentralFoam or rhoPimpleFoam(is there any proper other one?))
Is better in capturing viscous effects and... In a near to real shock tube problem.
What suggestions are there how to do that?
__________________
Injustice Anywhere is a Threat for Justice Everywhere.Martin Luther King.
To Be or Not To Be,Thats the Question!
The Only Stupid Question Is the One that Goes Unasked.
immortality is offline   Reply With Quote

Old   May 17, 2013, 14:39
Default
  #2
Senior Member
 
immortality's Avatar
 
Ehsan
Join Date: Oct 2012
Location: Iran
Posts: 2,205
Rep Power: 17
immortality is on a distinguished road
Hi
I have obtained new results and want to know the site users opinions.
I set a shock tube case with on left(p=932190,T=1248) on right(p=303975,T=440)
with analytical calculations of shock tube relations I obtained:
-----------------------------------
Analytical:

p2=p3=600048.0756
U=216.00739146
T3=1100.404069
T2=539.232544
rho3=1.899066462
rho2=3.875397513
-----------------------------------
I tested various scenarios and at last obtained these results for different solvers:
------------------------
rhoCentralFoam:
Code:
p=602505
U=224.899
T3=1132.55
T2=516.507
rho3=1.85297
rho2=4.06352
-----------------------
rhoPimpleFoam:
Code:
p=599864
U=215.897
T3=1099.83
T2=539.906
rho3=1.89972
rho2=3.8694
-----------------------
and sonicFoam:
Code:
p=598650
U=216.503
T3=1099.53
T2=533.801
rho3=1.896148
rho2=3.905709 (rho2 and rho3 calculated manually by perfect gas relation)
all values obtained in time=5e-5 s and in (.14,.02,0) location by drawing values on a line in paraview.cases are 1D inviscid.
now the question is that why rhoCentralFoam that is well-known to be appropriate in capturing discontinuties like shock wave has act somewhat off in comparison to others.
and in my experience rhoPimpleFoam has a low speed in run in comparison with rhoCentralFoam.
It appreciated all the opinions.
thanks.
__________________
Injustice Anywhere is a Threat for Justice Everywhere.Martin Luther King.
To Be or Not To Be,Thats the Question!
The Only Stupid Question Is the One that Goes Unasked.
immortality is offline   Reply With Quote

Reply

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
Solid Mechanics Solvers added to OpenFOAM Extend bigphil OpenFOAM Announcements from Other Sources 16 September 1, 2015 12:42
Zalesak ST A preliminary comparison of modern shock capturing mcaro Main CFD Forum 0 September 1, 2010 18:07
Comparison of CFD solvers for Hydrodynamic problem furkan Main CFD Forum 0 August 22, 2006 11:00
comparison of CFD solvers Vivek V. Ranade Main CFD Forum 2 November 26, 2000 15:34


All times are GMT -4. The time now is 01:04.