Wallpressure output from sloshingtank2D raises questions
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! |
Wallpressure computation in sampleDict
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? |
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