CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > General Forums > Main CFD Forum

Wallpressure output from sloshingtank2D raises questions

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 30, 2013, 23:55
Default Wallpressure output from sloshingtank2D raises questions
  #1
Senior Member
 
musaddeque hossein
Join Date: Mar 2009
Posts: 309
Rep Power: 18
musahossein is on a distinguished road
Dear all:

I am modeling a tank 1mX1mX0.1m. Mesh size is 100 Horizontal X 600 Vertical. Water height is 0.4m. The wall pressure is calculated during the interDymFoam run and gives the following output (I am providing a sample here):

# p POINT_DATA 1202
# x y z p
0.05 -0.500525 0 100004
-0.05 -0.500525 0 100004
0.05 -0.500525 -0.00166667 100014
-0.05 -0.500525 -0.00166667 100014
0.05 -0.500525 0.00166667 100002
-0.05 -0.500525 0.00166667 100002
0.05 -0.500525 -0.00333333 100032
-0.05 -0.500525 -0.00333333 100032
0.05 -0.500525 0.00333333 100002
-0.05 -0.500525 0.00333333 100002
0.05 -0.500525 -0.005 100050
-0.05 -0.500525 -0.005 100050
0.05 -0.500525 0.005 100002
-0.05 -0.500525 0.005 100002
0.05 -0.500525 -0.00666667 100068
-0.05 -0.500525 -0.00666667 100068
0.05 -0.500525 0.00666667 100002
-0.05 -0.500525 0.00666667 100002
0.05 -0.500525 -0.00833333 100086
-0.05 -0.500525 -0.00833333 100086
0.05 -0.500525 0.00833333 100002
-0.05 -0.500525 0.00833333 100002
0.05 -0.500525 -0.01 100104
-0.05 -0.500525 -0.01 100104
0.05 -0.500525 0.01 100002
-0.05 -0.500525 0.01 100002
0.05 -0.500525 -0.0116667 100122
-0.05 -0.500525 -0.0116667 100122
0.05 -0.500525 0.0116667 100002
-0.05 -0.500525 0.0116667 100002
0.05 -0.500525 -0.0133333 100140
-0.05 -0.500525 -0.0133333 100140
0.05 -0.500525 0.0133333 100002

Question is:
Are these realistic pressures? and are they in Pascals?
The tank is being laterally displaced with Asin(t/T) where A=0.0145 and T=1.2. So the displacements are very small. So why are the pressures so high? I hope I am missing something here and some one will be kind enough to point out the error to me. Thanks!
musahossein is offline   Reply With Quote

Old   August 2, 2013, 17:39
Default Wallpressure computation in sampleDict
  #2
Senior Member
 
musaddeque hossein
Join Date: Mar 2009
Posts: 309
Rep Power: 18
musahossein is on a distinguished road
Dear all:

I am modeling a tank LXHXb = 1mX1mX0.1m. My z=0 is at the fluid surface. I am running interdymfoam, sloshingtank2D.

Here is a sample output from the wall pressure:
X Y Z P
0.05 -0.4916 0 100096
-0.05 -0.4916 0 100096
0.05 -0.4916 -0.00166667 100106
-0.05 -0.4916 -0.00166667 100106
0.05 -0.4916 0.00166667 100086

Lets look at the last pressure value: P=100086. My pRefvalue=1e5. My static pressure is: 998.2*9.81*0.4=3916 kg/m^2

So my dynamic pressure=100086-100000-3916=-3830 ( a negative value!). What am I doing wrong here?
musahossein is offline   Reply With Quote

Reply

Tags
high wallpressure, sloshingtank2d, wallpressure


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
[swak4Foam] outputTime in Swak function immortality OpenFOAM Community Contributions 20 October 6, 2022 13:08
Sloshingtank2D sampleDict Wallpressure musahossein OpenFOAM Running, Solving & CFD 1 February 13, 2017 08:33
mixerVesselAMI2D's mass is not balancing sharonyue OpenFOAM Running, Solving & CFD 6 June 10, 2013 10:34
Questions about data output aki_yafuji OpenFOAM Running, Solving & CFD 3 September 9, 2010 02:59
Some output questions Ogbeni FLUENT 2 September 29, 2005 11:17


All times are GMT -4. The time now is 00:15.