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-   -   boat sink and trim (http://www.cfd-online.com/Forums/star-ccm/69209-boat-sink-trim.html)

emanuele October 15, 2009 09:25

boat sink and trim
 
Hello everybody,

i am trying to simulate boat sink and trim...i'm not interested to define good results for the transient and i would like to know what's tipically the max number of inner iteration for such a case.
Iam using 5 iterations per time step...do you think it is sufficient to define correct sink and trim value??or may i risk not to converge?
Many thanks

jsaelices October 18, 2009 05:36

I used to use a 5 or 10 iterations per timestep and solver always converge correctly. I think 5 is a good one in this case.

Do you how to create a control volume in star-ccm+?

emanuele October 18, 2009 07:34

Quote:

Originally Posted by jsaelices (Post 233069)
I used to use a 5 or 10 iterations per timestep and solver always converge correctly. I think 5 is a good one in this case.

Do you how to create a control volume in star-ccm+?

control volume has been created by the command : import>create block surface
I use half geometry for simmtrycal flow or whole model in such a case as manouvering where unsimmetrycal flow.

jsaelices October 19, 2009 10:03

How do you substract from the block surface the geometry of the model. Because you have to do this in order to process symmetrical flows, haven`t you?

emanuele October 19, 2009 12:32

i generally build a block surface and i intersect it with my hullshape...than i will cut the block by edges from intersection


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