|
[Sponsors] |
Panel method(3D) for calculating wave resistance of a ship hull |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
July 26, 2016, 08:02 |
Panel method(3D) for calculating wave resistance of a ship hull
|
#1 |
New Member
David
Join Date: Jul 2016
Posts: 4
Rep Power: 10 |
Hi,can any one help me in finding 3D panel method (Boundary Element Method) code (Matlab or Fortran) to calculate wave resistance for ship hull considering free surface.
I have written a Fortran code for this case and my code has about 20% error in comparison with experiment. NowI need an exact and correct code to modify my code. Thanks. |
|
July 26, 2016, 21:22 |
|
#2 |
Senior Member
adrin
Join Date: Mar 2009
Posts: 115
Rep Power: 17 |
1) have you tried your code at higher panel density? That is, is your solution converged? (2) what makes you think that 20% error is poor, or that you can get better accuracy with other panel codes? do you have evidence of that in the literature? I don't know the details of your problem but it seems to me that expecting high accuracy (in what appears to be a problem with viscous effects) from a potential flow code is unrealistic.
adrin |
|
July 28, 2016, 14:20 |
|
#3 |
New Member
David
Join Date: Jul 2016
Posts: 4
Rep Power: 10 |
1)No, I haven't. Because my laptop RAM don't allow. Yes, my solution is converged but until Fn=0.30, after this Froude number I couldn't get correct solution. 2)I see different paper used panel method and got relatively exact solution(error <10%).
|
|
July 28, 2016, 19:16 |
|
#4 |
Senior Member
adrin
Join Date: Mar 2009
Posts: 115
Rep Power: 17 |
Sorry, your answers to item (1) are inconsistent. You say your solution is converged though you also say you haven't done a grid convergence test! Perhaps you mean something else by "converged"?
As for others having obtained accurate solutions with panel methods, can you identify the fundamental differences between their approach and yours? The issue might be related to the order of the panel method, solution accuracy, modeling assumptions, implementation details, etc. I'm bringing up these points to recommend to you that there are a whole list of parameters for you to consider before delving into implementing something new/different. adrin |
|
July 29, 2016, 09:51 |
|
#5 |
Member
robo
Join Date: May 2013
Posts: 47
Rep Power: 13 |
Just a quick note in reply to Adrin above, but for wave resistance, there should be minimal effect of viscosity on a conventional hull form. The free surface wave caused by a ship is a largely inviscid phenomenon. I would say a panel code should be able to do better then ~20%. Panel codes are still quite common for many marine applications involving waves, eg seakeeping. Total resistance however will have significant viscous effects.
|
|
July 29, 2016, 12:33 |
|
#6 | |
New Member
David
Join Date: Jul 2016
Posts: 4
Rep Power: 10 |
Quote:
One of the main articles that I have used is entitled 'Computation of wave-making resistance of a catamaran in deep water using a potential-based panel method' by Tarafder, There are some other papers by this auther for calculating wave resistance of a monohull ship. I implemented the formula used in the paper exactly but I couldn't get the results of the paper. |
||
July 29, 2016, 12:37 |
|
#7 | |
New Member
David
Join Date: Jul 2016
Posts: 4
Rep Power: 10 |
Quote:
|
||
Tags |
bem, free surface, panel method, ship hull, wave resistance |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Ship Wave Making Resistance | Yasser | CFX | 8 | May 27, 2017 09:28 |
Resistance calculation for flow around a ship hull | manoj_nav | OpenFOAM Running, Solving & CFD | 0 | December 17, 2015 02:03 |
Ship Resistance and wave profile | zinn | FLUENT | 1 | February 20, 2015 07:50 |
How to output the water resistance on a Ship hull | Sachin m | OpenFOAM Post-Processing | 1 | January 26, 2015 13:24 |
Ship wave making resistance calculation | Tayyaba | STAR-CCM+ | 2 | July 20, 2012 08:06 |