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Old   July 25, 2014, 06:07
Default Sloshing of tank
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liladhar
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Hi Everybody,
I am trying to simulate tank sloshing in roll motion. I successfully simulated tank sloshing given the periodic surge motion. But when i am give roll motion i am getting error. I am using CFX. The tank is given specified displacement. I am using cylindrical coordinate system. Following the expression i am using
A = 0.17 [rad]
Amplitude = if (t<=8[sec], A, 0[rad])
disp = Amplitude*cos (omega*t)*1[m]/1[rad]

the error i am getting is ATTACHED IN FILE.
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File Type: txt output.txt (3.6 KB, 18 views)
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Old   March 12, 2018, 01:37
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SAMBHU JAYACHANDRAN
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Quote:
Originally Posted by liladhar View Post
Hi Everybody,
I am trying to simulate tank sloshing in roll motion. I successfully simulated tank sloshing given the periodic surge motion. But when i am give roll motion i am getting error. I am using CFX. The tank is given specified displacement. I am using cylindrical coordinate system. Following the expression i am using
A = 0.17 [rad]
Amplitude = if (t<=8[sec], A, 0[rad])
disp = Amplitude*cos (omega*t)*1[m]/1[rad]

the error i am getting is ATTACHED IN FILE.
Hey i am also doing sloshing experiment. I am using fluent. You used a UDF here for oscillating motion
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Old   March 12, 2018, 08:54
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urosgrivc
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Hi,

It clearly says your mesh is of pour quality. Try some inflation layers on the walls if you dont have them allready.
You dont have any mesh deformation enabled, do you? I mean because of the posibility to colapse the mesh near moving walls
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Old   March 13, 2018, 06:25
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Erik
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My guess is:

+--------------------------------------------------------------------+
| ERROR #002100027 has occurred in subroutine cNWDIST. |
| Message: |
| At least one highly skewed element has been detected on a wall |
| boundary, leading to an unreliable near-wall distance calculation |
| for the turbulent wall functions. The solver will continue |
| to execute, but convergence and/or accuracy may be affected. |
| Please consider improving the mesh quality. The coordinates of |
| the element face are ( -0.3102E-02, 0.2000E+00, -0.1831E-02 ). |
+--------------------------------------------------------------------+

but it's just a guess.
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Old   May 1, 2018, 04:54
Default volume fraction axis changed
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hi,

i am facing a change in the axis direction in the final stage.The picture is added.
kindly tell a solution..as the water volume should be horizontal(in green)
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File Type: docx sloshing.docx (106.0 KB, 5 views)
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Old   May 1, 2018, 05:07
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Gert-Jan
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Ask your question in the fluent forum.......
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