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

interDyMFoam and acceleration

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   February 18, 2011, 09:47
Default interDyMFoam and acceleration
  #1
New Member
 
nikita tryaskin
Join Date: Oct 2009
Location: Helsinki/St. Petersburg
Posts: 22
Rep Power: 7
eternityboy is on a distinguished road
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)
Attached Images
File Type: jpg first.jpg (23.4 KB, 11 views)
File Type: jpg second.jpg (23.7 KB, 7 views)
eternityboy is offline   Reply With Quote

Reply

Thread Tools
Display Modes

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 On
Pingbacks are On
Refbacks are On



All times are GMT -4. The time now is 17:00.