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How to simulate problems with rotating motion |
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#1 |
New Member
feiqunali
Join Date: Jul 2011
Posts: 13
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Hello, I am now trying to simulate flapping wing with pitching motion, which need an unsteady solver that can simulate rotating problems. Which solver should I choose and can anybody provide some related case?Thanks a lot!
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#2 |
Member
Stefan
Join Date: Jan 2010
Location: Kiel, Germany
Posts: 81
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Hi,
Can you be more precisely about your problem, where you need the rotating motion? I would guess, that you need automatic mesh motion for the rigid flapping wing. Since you expect moderate motions of your wing than mesh morphing might be an appropriate set-up. There is a simulation of a flapping airfoil with OpenFOAM. Unfortunately, i haven't got the web link right now. Maybe, you will take a look into the OF workshops. As you mentioned "rotating motion" which is either provided by GGI implementation in 1.6-ext or as a solid body motion called rotatingMotion in 2.0.x! You will find it within src/dynamicFvMesh/* directory of your preferred OpenFOAM version. /Stefan |
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#3 |
Senior Member
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Hello,
you are probably interested on the PHD thesis of Frank Bos. Numerical simulations of flapping foil and wing aerodynamics, mesh deformation using radial basis functions (RBF). This research is direct applicable to Micro Air Vehicle design and in Wind Turbines. The RBF is now part of OpenFoam-extent former OpenFOAM-1.5-dev version =>http://www.cfd-online.com/Forums/ope...on-solver.html You can find the PHD-Thesis online http://repository.tudelft.nl/assets/...daa1b2/bos.pdf (size 11MB) The other interesting things might be based on the PHD-thesis of "Sandeep Menon" Adaptive Tetrahedral Re-Meshing for Deforming Domains, http://www.openfoamworkshop.org/6th_...ney_slides.pdf |
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#4 |
New Member
feiqunali
Join Date: Jul 2011
Posts: 13
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The rotating motion is defined by a=a0*sin(2*pi*f*t),a is the angle of attack. Do you mean that I could not simulate such motion in OF1.7.0? By the way, I thought I should use pimpleDyFoam, but I dit not know how to set the boundary condition.
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#5 | |
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feiqunali
Join Date: Jul 2011
Posts: 13
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Quote:
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#6 | |
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feiqunali
Join Date: Jul 2011
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#7 | |
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Stefan
Join Date: Jan 2010
Location: Kiel, Germany
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Quote:
I am not sure, but i think RBF and GGI indeed are exclusively implemented in 1.6-ext! May someone else could give you more details. What about the derived boundary conditions like movingWallVelocity, rotatingWallVelocity, etc. May there is one appropriate bc for harmonic oscillation as well. |
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#8 | |
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feiqunali
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#9 |
Senior Member
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Hi,
you need OpenFOAM-1.6-ext https://openfoam-extend.svn.sourcefo...nd/trunk/Core/OpenFOAM-1.6-ext/src/dynamicMesh/meshMotion/ =>RBF to get your Hands on RBF i would advise you to take the LIVE DVD of the EXTEND version from the openfoam workshop download from http://rcc.its.psu.edu/ofw6/ofw6_v8.iso in the tutorials the is some not very sophisticated stuff on RBF but boundary conditions etc. are set there |
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#10 |
New Member
Dave Smith
Join Date: Jul 2010
Posts: 27
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Hi Guys
Does anyone have any tutorials or cases setup which involve a flapping wing in a moving mesh? I want to model this but am having a difficult time with boundary conditions and am not sure where they need to be implemented and how the should be implemented for a simple sinusoidal motion (theta=A*sin(2*pi*f*t)). Also I understand that RBF can be used for this but can openfoam do this in version 1.7 aswell using a different method? I want to use an unstructured grid. Thanks in advance Dave |
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#11 |
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aerosapien
Join Date: Sep 2010
Posts: 59
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is it possible to do flapping simulation using STARCCM+ CFD code???
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unsteady ; rotating |
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