# Dynamic mesh, wall motion

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 January 19, 2006, 06:19 Dynamic mesh, wall motion #1 Giuseppe Guest   Posts: n/a Hello to all, how can I define the wall motion, h(t)=Ho*sin(omegat)? I have to use UDF or profile in dynamic mesh? I'm studying the behaviour of a bridge section (great belt east bridge) and I have to analyze the formation of vortex shedding in both cases of fixed section and moving section, immersed in a bidimensional unsteady flow. Please help me, thank you

 January 19, 2006, 09:26 Re: Dynamic mesh, wall motion #2 Luca Guest   Posts: n/a Ciao Giuseppe! You should use a UDF for the dynamic mesh model. I think the DEFINE_GC_MOTION could be what you need. Luca

 January 19, 2006, 12:47 Re: Dynamic mesh, wall motion #3 Giuseppe Guest   Posts: n/a Grazie Luca! Do you have an example of this kind of UDF? Can you send me it? Are you the ing. with which I spoke the past time?

 January 19, 2006, 12:54 Re: Dynamic mesh, wall motion #4 Luca Guest   Posts: n/a Yes Giuseppe, here I am! No unfortunately I have no example to give you but you should look at the manual. The example you find is all you have to do to set the cg motion. Luca

 January 19, 2006, 13:30 Re: Dynamic mesh, wall motion #5 Giuseppe Guest   Posts: n/a thanks any way, see you later

 January 19, 2006, 14:56 Re: Dynamic mesh, wall motion #6 J. Kim Guest   Posts: n/a Giuseppe, You are going to do what I want to do. I hope to share experiences together. Have you ever tried simulation for a fixed bridge? If yes, what about the results such as Cd, Cl, Strouhal number ...? My results (using k-e, RSM and 2-dimensional steady, unsteady) were not close to the experimental data.

 January 20, 2006, 04:25 Re: Dynamic mesh, wall motion #7 Giuseppe Guest   Posts: n/a Hello Kim, firstly, I have to simulate the flow past a circular cylinder to optimize my calculate; secondly, I have to simulate the Great Bealt Est Bridge section. For comparison, can you tell me which parameters you have set in your problem? Solver, Material, Re, boundary conditions, Control solution, etc. In addition, how can i check the convergence through the residual plot?

 January 20, 2006, 09:26 Re: Dynamic mesh, wall motion #8 J. Kim Guest   Posts: n/a I used a model scale and compared CFD results with other experiment and numerical analysis data in terms of mean drag coefficient, fluctuating (i.e. root mean square (RMS)) lift coefficient, Strouhal number. For solver, 2nd order in spatial and temporal discretization. Unsteady. Segregated. SIMPLE, etc. For material, air was used. Rectanguler shape computational boundary was used. For inlet boundary : inlet velocity; outlet boundaryressure outlet. Upper and bottom boundaries:symmetry boundary conditions were employed.

 January 20, 2006, 11:00 Re: Dynamic mesh, wall motion #9 Giuseppe Guest   Posts: n/a Do you have used Gambit like prepocessor? Whit which experiment and numerical analysis do you have compared your simulation? Firstly, i have studied a tutorial about a cylinder cross by a bidimensional flow? Do you want it? Which is the geometry of your section?

 January 20, 2006, 12:02 Re: Dynamic mesh, wall motion #10 J. Kim Guest   Posts: n/a You may have experimental and numerical results by searching Google just typing in "Grate Belt East Bridge". And papers were published in the Journal of Wind Engineering and Industrial Aerodynamics.

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