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September 26, 2013, 00:25 |
Surfboard fin CAD models
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#1 |
Senior Member
Brett
Join Date: May 2013
Posts: 212
Rep Power: 13 |
Hi There fellow CFDers
Im trying to get my hands on a variety of surfboard fin cad models for a cfd thesis. Ive got two from this website but was hoping for more. Basically im trying to look at how base width and rake angle effect Cl and Cd coefficients. Any help is much appreciated and wont be used in a commercial setting. Cheers Brett |
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January 4, 2014, 20:50 |
CAD Fin Models
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#2 |
New Member
Join Date: Jan 2014
Posts: 5
Rep Power: 12 |
Hi Brett,
Are you still progressing your research? I am very interested from a personal perspective on CFD modelling of fins. I am in the process of teaching myself fin design using BoardCAD and fin foil. These are open source packages and seem to be quite useful. I would be very interested in your research particularly the CFD side of things. Will you be looking at OpenFOAM? TK |
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January 4, 2014, 23:16 |
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#3 |
Senior Member
Brett
Join Date: May 2013
Posts: 212
Rep Power: 13 |
Hi TK,
No im not anymore, I submitted the thesis in november. I found that over a large range of conditions the 3 fin thruster set up tends to work the best, which would make sense as its the industry main stay. if you can figure out how to use some kind of CAD model to generate a lot of different fin models that would be fantastic. I found just finding CAD models to be the hardest part. I used FLUENT so the geometry files basically have to be solidworks files, which im hopeless with. I would recommend investigating the CL and CD values with the different fin models, specifically in relation to base width and rake angle. theres a few industry thoughts that you could prove or disprove. I wasnt looking at OpenFOAM no, i used FLUENT. As it was a Masters thesis there was no need to re-invent the wheel so to speak, but it does provide a pretty comprehensive CFD study, it just lacks the kind of concrete conclusions i was hoping for. Are you doing this for university or work? Brett |
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January 5, 2014, 00:12 |
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#4 |
New Member
Join Date: Jan 2014
Posts: 5
Rep Power: 12 |
Hi Brett,
Thanks for the reply. My main area of interest in this topic is a personal one, not work or university related. I am a communications Engineer who enjoys all things surfing. There's a lot of speculation and opinions regarding fin profiles and configurations and I would like to do some informal testing of various fin shapes to confirm theories. I am very interested in elliptical shapes, mainly spitfire type shapes and NACA symmetrical foils. I am still getting up to speed on fluid dynamics and am doing quite a bit of reading at the moment on the subject. Also reading through some other work done by various individuals. WRT CAD models for fins, I am by no means a CAD guru. I am limited to open source software so I've been investigating options in that space. I have seen BoardCAD used with Jython scripts to generate 3D models of fins so I'm interested in spending a bit more time on that. FinFoil is also showing promise as a user friendly fin CAD program but it is still under development and not quite there. Apparently Swansea University has developed a user friendly Fin CAD program but it is not freely available. I would very much like to read your thesis if that is at all possible. I am interested in your testing methodology and maybe adapting it to OpenFOAM. Again I don't have access to FLUENT so I'm limited to open source software. Anyway, thanks again for the reply. Looking forward to hearing your thoughts. TK BTW, here's a link to my blog. I make wooden surfboards in my spare time. http://www.thewoodbuddha.blogspot.com.au/ |
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January 5, 2014, 01:27 |
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#5 |
Senior Member
Brett
Join Date: May 2013
Posts: 212
Rep Power: 13 |
TK,
Im happy to send you my thesis but its about 75 pages so its not a quick read. Fluid dynamics is a very complicated field and there are certainly no easy answers. Infact the Navier stokes equations have still not been solved analytically for turbulent flow. By Engineer do you mean you went to university or does that mean youre a technician sort of person? the term gets thrown around alot. If youve got an advanced maths knowledge, mostly around PDEs then you could chip away at the knowledge. A good place to start is to familiarise yourself with the Navier stokes equations, start with 1D and then expand that to 2,3D when youre comfortable, these are the fundamental equations for fluid dynamics, CFD turns them into discrete data and crunches the numbers for us. whats your email address? this forum only allows a max of 97.7kb for attachments. Brett |
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January 5, 2014, 03:25 |
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#6 |
New Member
Join Date: Jan 2014
Posts: 5
Rep Power: 12 |
Thanks Brett.
My email address is woodbuddha1@gmail.com Looking forward to reading your thesis. I went to university at QUT but I also trained as an electronics technician. Thanks again. TK |
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April 6, 2014, 12:44 |
Cfd
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#7 |
New Member
Ben Patrick
Join Date: Apr 2014
Posts: 2
Rep Power: 0 |
Hi Brett,
I am also interested in CFD analysis of a surfboard fin, Im currently writing my dissertation on a new concept surf fin. Was just wondering whether you would send me your thesis too. Thanks Ben |
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April 6, 2014, 21:58 |
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#8 |
New Member
Join Date: Jan 2014
Posts: 5
Rep Power: 12 |
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April 6, 2014, 23:23 |
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#9 |
Senior Member
Brett
Join Date: May 2013
Posts: 212
Rep Power: 13 |
Hi Ben,
Yeah no worries, whats your email and ill send it through? At a guess id say youre working on a hydrofoil fin? ive seen some sketches of those, looks promising. Brett |
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April 8, 2014, 11:23 |
Dissertation
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#10 |
New Member
Ben Patrick
Join Date: Apr 2014
Posts: 2
Rep Power: 0 |
Hi Brett,
my email is: ben@apvl.co.uk Not quite a hydrofoil i have taken an idea from formula 1 and added a feature to fin so far looks really promising. TK- im using CFX in ANSYS workbench would love to elaborate, once my dissertation is done and i have patented my idea ill post up some details and pics. Thanks Ben |
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May 28, 2015, 12:29 |
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#11 |
New Member
Hans Robeers
Join Date: May 2015
Posts: 1
Rep Power: 0 |
Hi Guys,
I'm the creator of finFoil. Today it is already possible to create STL files like the one shown below. Visit http://hrobeers.github.io/finFoil/po...d_to_v1.1.html for more information. I know it's a bit late, but it's good for future reference. Kind Regards, Hans |
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February 13, 2019, 21:00 |
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#12 |
New Member
Panos Koniavitis
Join Date: Oct 2017
Posts: 6
Rep Power: 8 |
Hi Brett,
your research and work seem very interesting. I am starting to look at some surfboard cod and would be very happy to see your dissertation if it's available? My email is pkoniavitis@yahoo.com. all the best, Panos |
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