Differents between the three DTCHull tutorial and meaning of free trim
 

Dear Foamers,
good morning.

I just made run the tutorial DTCHullWave and the results are within just three steps. I would like to increase the steps, do you know how to do that?

Talking about the tutorial of DTCHull, at moment are three available for Openfoam 5.x:

1) DTC Hull using the solver interFoam
2) DTC Hull using the solver interDyMFoam
3) DTC Hullwave usign the solver interDyMFoam

Do you have material where I can read the differents between these 3 tutorials or if you know that, can you be so kind to let me know the differents between them?

In the explanation of DTCHull available on internet http://www.sourceflux.de/…/upl…/2014...r_vol50no3.pdf there is a point where it says:. "The hull was ballasted at the design draft 14.5 m with zero trim, and was free in trim and sinkage".
Which make me a bit confuse because I don't understand if this condition is valid for all the tutorials of DTCHULL available for OpenFoam 5.
I also would like to understand the meaning of this sentence because if as boundary condition there is zero trim and then it is possible to have a free trim afterwards, then why the vessel it doesn't move for the DTCHull interFoam and for the DTCHull InterDyMFoam (which I expect that the vessel can sinkage)?

Thank you in advance, ;)

Raffaele Frontera

Confusion about DTCHUll
 

I have same doubt about the difference between all three examples of DTCHUll. I am new to openfoam. I m using OF-5.
i am asked to calculate resistance and also get the sinkage & trim of vessel and get the simulation for same.

Hi, plz let me share my points the DTC cases.


The first one is designed to get the resistance of DTC advancing in steady water. If the hull keeps steady, incoming flow is expected. In this case, squat and pitch et al are uninterested.


The squat and/or pitch motion can be obtained in the second case.


Six-degree freedom motion of DTC hull is calculated. In heading wave, pitch and heave are more significant than surge, sway, yaw and roll.


//from Jason