Author |
Message |
Mehdi Naderi (mnader4)
Member Username: mnader4
Post Number: 19 Registered: 12-2006
| Posted on Friday, November 02, 2007 - 05:33 pm: | |
Hi, I will appreciate if you answer my question. Suppose we have a fin (clamped at one end and free at the other end) which fluctuates sinusoidally. Can flexpde solve the velocity field around fin? If no how can I make it easier untill my problem be solved? Is there any topic posted here similar my problem? Thank you so much again, Mehdi |
Robert G. Nelson (rgnelson)
Moderator Username: rgnelson
Post Number: 981 Registered: 06-2003
| Posted on Friday, November 02, 2007 - 06:07 pm: | |
You should be able to do this with a moving mesh along the lines of our sample problem "Samples|Moving_Mesh|2d_cyl_piston.pde" You will need an analytic expression for the boundary of the fin vs time. The piston problem treats a compressible gas, but you can replace the equations with incompressible ones.
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Mehdi Naderi (mnader4)
Member Username: mnader4
Post Number: 20 Registered: 12-2006
| Posted on Tuesday, November 06, 2007 - 12:41 pm: | |
Dear Mr. Nelson, Thank you so much. I am working on that problem. I will appreciate if you answer my questions about pressure equation: Note: my problem is time dependent 1-For air as fluid around the fin: I used pressure equation of 2d_cyl_piston.pde. P: dt(P) + u*dx(P)+v*dy(P) + gamma*P*(dx(u)+dy(v)) = div(grad(P)) 2- for water as fluid: I used: p: dt(p) +u*dx(p)+v*dy(p)= (p-p0+penalty*rho)*(dx(u)+dy(v)) (I simplified dt(dens) + div(dens*U) = 0 and replaced dens with pressure: dense=(p-p0)/penalty+dens0) Am I right? Regards, Mehdi
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