# Sloshing of tank

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July 25, 2014, 06:07
Sloshing of tank
#1
Member

Join Date: May 2012
Posts: 35
Rep Power: 14
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
Amplitude = if (t<=8[sec], A, 0[rad])

the error i am getting is ATTACHED IN FILE.
Attached Files
 output.txt (3.6 KB, 19 views)

March 12, 2018, 01:37
#2
New Member

SAMBHU JAYACHANDRAN
Join Date: Mar 2018
Location: KERALA, INDIA
Posts: 4
Rep Power: 8
Quote:
 Originally Posted by liladhar 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

 March 12, 2018, 08:54 #3 Senior Member   urosgrivc Join Date: Dec 2015 Location: Slovenija Posts: 365 Rep Power: 11 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

 March 13, 2018, 06:25 #4 Senior Member   Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,171 Rep Power: 23 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.

May 1, 2018, 04:54
volume fraction axis changed
#5
New Member

Join Date: Nov 2016
Posts: 16
Rep Power: 9
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)
Attached Files
 sloshing.docx (106.0 KB, 6 views)

 May 1, 2018, 05:07 #6 Senior Member   Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,854 Rep Power: 27 Ask your question in the fluent forum.......

 Tags cfx 14, roll, sloshing