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Naval Architecture CFD: How to get started?

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Old   December 2, 2010, 13:38
Default Naval Architecture CFD: How to get started?
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Itfan Argo
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I'm a naval architecture student interested in CFD simulations. I'm not studying yet CFD at school (it's on master's degree), although I'm 4th year.
I've heard my teachers speaking about ShipFlow and many other CFD software, therefore I'm a bit interested and willing to learn, maybe I can do some work for my final thesis.
I could have Ansys(CFX) installed, but I need a start. Unfortunately, my main experience with numerical computations is basic (FEM).

How to get started?

Thank you, Stefan.
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Old   December 6, 2010, 05:31
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Chih Fang
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I think u can try to download the tutorial and start learning the basics..
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Old   December 10, 2010, 22:19
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Pano
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Hi!

So, just to make some things clear, it is nearly impossible to apply CFD to study the flow around a hull, because
- it is a really complex 3d geometry and you will need numerous variations in your grid to grasp details in the "interesting areas"
- no available turbulence model will work fine for the whole hull, most models will be pretty accurate in limited regions and will blatantly fail in others resulting in totally meaningless oevrall results, if you manage to get any results whatosoever! To fix this, you will then have to define UDFs, that's another story...
- you have free surface (waves)

You can use potential flow codes, like ShipX to get started with first-principles hydrodynamic calculations.

If you still want to get CFD into yacht/ship design, consider seriously going into 2d problems. There are a number of problems that still make sense if you make assumptions and study them as 2d. The keel, the rudder, stabilisers, fouling, effect of through-hull fittings, the sails, rigging (for yachts); these are all problems that can be examined in 2d. I insist that you stay away from 3d geometries, you will have numerous problems, both in the mesh and the flow simulation.

Even in 2d, I would say the best advise is this: stick to the simplest and most coarse mesh possible every time and get things working before you engage yourself with the painful grid sensitivity study (i.e. how the density of your mesh affects the results). Then try to do the best with the quality of the mesh (there are tools to check your mesh on every aspect) rather than apply post-processing tools to fix it. That means, spend more time on gambit or any mesh generator you're using and dont rely much on the post-processing tools that Fluent provides; to adapt the basic y+/y* values.

Yeah, start with the tutorials and ignore those with heat transfer and those which employ the energy equation - you are not interested in those.

I did my thesis on yachts' keel bulb design (drag optimisation of symmetrical foils for keel bulbs) last year, in the end it went pretty well but ... too much hassle...
Anyways, good luck.
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Old   December 15, 2010, 15:44
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Vieri Abolaffio
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i agree with panu. start with the theory (books of anderson or kundu might give a nice introduction)

keep the first cases as simple as possible

grow slowly with the complexity of the phenomena. it is pretty easy to abtain pretty pictures, but it is hard to have meaningful results.

good luck.
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Old   January 27, 2011, 03:03
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Tobino
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Hello Pano,
I am studying UDF for calculate ship resistance to o. Can you help me how to load File.c in to Fluent  right.In viscous Model what model is better for c alculating ship resistance lamiina, k-epsilon or o ther. Please help me how I can know them.any advise to welcome email: ducminh207@gmail.com.
Thanh you very much

Last edited by tobino; January 28, 2011 at 02:04.
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Old   June 6, 2015, 13:20
Default Free Naval CFD Course
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mathapan
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Dear Sefan,
You can visit www.navalcfd.com for free tutorial
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Old   October 6, 2015, 12:16
Default Shipflow software
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Nguyen Quoc Bao
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Hi guys,
I see many discussion above about Shipflow.
I wanna study about this one also, but I dont have this Shipflow.
Could you send me this software? Link or...
If any, please directly send me information via cheljin1320@gmail.com.

Thank in advance.
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Old   May 16, 2016, 14:07
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Romulo Alvarez
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Hello everyone, I am yacht designer and now I have unterest in the use of CFD
tools for hull design.
I have Caeses software from friendship, but I need advice in how use It with openfoam.
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