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-   -   interDyMFoam and acceleration (http://www.cfd-online.com/Forums/openfoam/85160-interdymfoam-acceleration.html)

eternityboy February 18, 2011 08:47

interDyMFoam and acceleration
 
2 Attachment(s)
good day

im trying to simulate impact of the TANK
i have some curve with the speed
for example 5m/s and 0m/s after 1 second

i've tried to use SKA
and use .dat file for the coordinates
something like that

(0 ((0 0 0) (0 0 0)))
(1 ((5 0 0) (0 0 0)))
(2 ((10 0 0) (0 0 0)))
(3 ((15 0 0) (0 0 0)))
(4 ((20 0 0) (0 0 0)))
(5 ((25 0 0) (0 0 0)))
(5.1 ((29.5 0 0) (0 0 0)))
(5.2
(5.3
...
(5.9 ((47.5 0 0) (0 0 0)))
(6 ((47.5 0 0) (0 0 0)))
(15 ((47.5 0 0) (0 0 0)))

something like that..

so i got the results
and the picture for alpha(liquid) looks pretty nice(physically)
but the PRESSURE!!
before 5 secs i have normal pressure according to rhoGh
after... i have some insane values

can u suggest something

maybe i should do something different to simulate this

and one more question... it seems that i have to place coordinates to the .dat file
but, maybe there is a way i can apply velocity changing to the TANK

maybe i have to change/add something in momentum equation
if so, can you follow me how to do that..
i've tried to look through Ueqn.C but still a little bit confused on how the things work.

here are two slides for pressure on the far bottom of the tank


i've tried coarse mesh and fine mesh(900.000) cells..
i've tried laminar and kEpsilon
but the result is the same..

as well i decreased deltaT and maxDeltaT (around 0.0001 - 0.00001)


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