Any good Aero-hydrodynamic book?

[Guest]

Hi! I am a student doing a mechanical degree at university. I already have a technical degree in aeronautic construction. What I would like to do during my degree is a design of a sailboat. Exactly, I would like to do a parametric model with all the features concerning hydrodynamics so I need a good complete book about it! I already had a course on aerodynamic, I guess it goes in the same mood but if not, I'll manage it anyway! I will have courses of "fluids dynamic" (I am not sure of the name in english) so the book can be quite technical, but if there's one with explicit explanations of concepts... that would be just easier to get in mind! I am planing to do it with Catia V5 so if someone has regards or tips with this, just tell me.

Thanks!

[Guest]

"The Symetry of Sailing" by Ross Garett.

[tspeer]

Larsson & Eliasson, "Principles of Yacht Design".
Marchaj's "Aero-Hydrodynamics of Sailing" and "Sailing Theory and Practice" have lots of wind tunnel data, but all the data are for different configurations and it's difficult to apply them to a specific design.

Hoerner's "Fluid Dynamic Drag" and to a lesser degree "Fluid Dynamic Lift" are invaluable for estimating fluid dynamic coefficients for all sorts of things from rigging to people.

Today, there are some good computational fluid dynamics resources that can be used in lieu of test data. XFOIL probably does as good a job of providing 2D section data as most wind tunnels, with the exception of maximum lift. Panel codes (CMARC, VSAERO, Panair) or vortex lattice codes (Linair) can be used to estimate 3D lift and induced drag of specific configurations.

[nico]

Hi,

Concerning Panair, is it possible to provide good values of drag for bulbs?

[Jimboat]

Check out the "Secrets of Tunnel Boat Design" book (http://www.aeromarineresearch.com/stbd2.html) and the "History of Tunnel Boat Design" book (http://www.aeromarineresearch.com/history.html) .

[tspeer]

Panair can provide accurate induced drag for bulbs provided that the flow is fully attached. However, I'm not sure if it has a boundary layer code, too. See:

Tinoco, Gentry, et al, "IACC Appendage Studies," The Eleventh Chesapeake Sailing Yacht Symposium, January, 1993.

[Vince]

A friend told me about Rhino 3d and showed me the panel of option concerning hydrostatic and...Somebody can give me a feed back about it!
Thanks

[Vince]

i am the student who posted this subject...
Vince

[dougfrolich]

I saw a demo of a $250 plug in for Rhino that does hydros, it looked pretty cool you can find more info at rhino3d.com. But if you really want a great Lines program and really powerful Hydros check out Maxsurf and HydroMax.

[nico]

I looked at the above reference (Tinoco). Panair (A502) provided lift, and induced drag. Zero lift drag was estimated from semi empirical methods. The drag estimates was found to be higher than experimental results. (For the bulbs )

Nico

[nico]

They used a Viscous Panel Analysis System too (A598) but for the ballast bulbs the results were not succesfull. It was used to get the profile drag of the keel and the winglets.

Is Panair a program worth buying?

Nico

[tspeer]

Panair (http://www.pdas.com/) is not the only panel code available. Others include CMARC (http://www.aerologic.com/) and VSAERO (http://www.am-inc.com/). Panair uses a high-order method, while CMARC and VSAERO are low-order Morino method codes. All of these were developed in the aerospace industry.

There are other methods that may be more applicable to boats, such as Splash (http://www.panix.com/~brosen/), FSWAVE (http://www.am-inc.com/) and SLAW (http://www.ship.saic.com/overview_slaw.html). After that, you start to get into the higher end CFD methods, such as Navier Stokes codes.

But the code alone is not the only thing, or even maybe the most important thing. You also need a way of generating the grid used as input to the code, and a way of making use of and displaying the output. Computational fluid dynamics isn't called "the science of pretty pictures" for nothing! Although a version of Panair is in the public domain, you may have to roll your own pre- and post-processing software, and this can be more expensive than buying an off-the-shelf system.

So what's worth buying depends a lot on what your time is worth, what your project can support, and what your long-term plans are. I've not personally used Panair, yet, so I don't know how much effort it takes.


http://www.vacantisw.com/CFD_article.HTM
http://www.cfd-online.com/Resources/soft.html
http://www.panix.com/~brosen/AIAA-2000-4339.pdf
http://www.hiswasymposium.com/proceedings/Levadou.PDF