On the Role of Coherent Structures in a Lid Driven Cavity Flow
The coherent vortex extraction (CVE) is a technique based on the nonlinear filtering of the vorticity field projected onto an orthonormal wavelet basis. The coherent vortices of the flow are reconstructed from few strong wavelet coefficients, while the incoherent background flow corresponds to the majority of weak wavelet coefficients. Here CVE is applied to a lid driven cavity flow. Only 2.3% of wavelet coefficients are necessary to capture the coherent structures and contains almost all the enstrophy. The incoherent flow, which is the remaining, is structureless and noise-like. The results show that lid driven cavity flows are characterized by the presence of pronounced coherent structures.
KeywordsDirect Numerical Simulation Coherent Structure Compression Rate Direct Numerical Simulation Data Coherent Part
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