Lecture 12 Notes - EGN 3353C Fluid Mechanics Lecture 12...

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EGN 3353C Fluid Mechanics Lou Cattafesta MAE Dept. University of Florida Lecture 12 Examples of Fluid Motion Example 1 Compressible vs. incompressible flow Notes : 1) We can say that a flow (as opposed to a fluid ) is incompressible or not. 2) High speed flows (sound speed) M U = > ~0.3 involve significant density changes and are generally regarded as compressible. 3) Some low speed flows are compressible (e.g., sound, buoyant flows). Recall, for incompressible flow, N N N 1 0 xx zz yy uvw V xyz d dt εε ε = ∂∂ ++ = = ∂∂∂ G G i ± The example at left of 2-D flow through a contraction shows that the volume of each 2-D fluid element does not change. ± Note that the above equation is valid for steady and unsteady flow.
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EGN 3353C Fluid Mechanics Lou Cattafesta MAE Dept. University of Florida Example 2 Stagnation point flow (e.g., a jet impinging on a surface). Calculate rate of translation, vorticity, linear strain rate, volumetric rate of change, shear strain rate.
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Lecture 12 Notes - EGN 3353C Fluid Mechanics Lecture 12...

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