Youtor
Squeeze flow
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=XYcT9J500qE
CFD simulation of the flow between two plates, where the top plate oscillates sinusoidally in the vertical direction (symmetry was used, video shows only right half). This was solved using STAR-CCM+ v3.02, which at the time did not have any moving mesh capabilities. In order to model the movement of the upper surface a custom Java macro was created, which exploited the software's ability to map a solution from one mesh to another. • • To begin developing the model, a simple Visual Basic macro was created in Solidworks to create the geometry. This macro would take the geometry, change a dimension (based on the amplitude, frequency, and time step), save the model as a .step file with a unique name, and then repeat the process. • • After the geometry files were created, a Java macro was created in STAR-CCM+ to mesh each geometry. The macro would open each geometry file, create the mesh, save the mesh as a .ccm file with a unique name, and then repeat the process. • • Finally, the Java macro that modeled the moving mesh was created. This macro would import a mesh, map the previous results to the new mesh, change the rate of the volume source, iterate, and then repeat. • • After solving the CFD model, the results were compared to an analytical solution obtained by solving the Navier-Stokes equations with an oscillating boundary. The solution obtained (as shown in the video) was valid only for Reynolds numbers much less than 1. The equation was entered into STAR-CCM+ as a field function for visual comparison. The CFD results were found to agree well with the analytical results. • • For description of symbols: • http://img48.imageshack.us/img48/3599...
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