Coherent Vorticity Extraction in 3D Homogeneous Isotropic Turbulence: Influence of the Reynolds Number and Geometrical Statistics
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| Format: | Artículo científico |
| Langue: | en |
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Sociedade Brasileira de Física
2009
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| _version_ | 1876475376139501568 |
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| author | Benjamin Kadoch |
| author_facet | Benjamin Kadoch |
| contents | Coherent Vorticity Extraction in 3D Homogeneous Isotropic Turbulence: Influence of the Reynolds Number and Geometrical Statistics Benjamin Kadoch Margarete Oliveira Domingues Ingmar Broemstrup Lionel Larchevêque Kai Schneider Marie Farge Física, Astronomía y Matemáticas Wavelets coherent structures isotropic turbulence direct numerical simulation The coherent vorticity extraction method (CVE) is based on the nonlinear filtering of the vorticity field projected onto an orthonormal wavelet basis made of compactly supported functions. CVE decomposes each turbulent flow realization into two orthogonal components: a coherent and an incoherent random flow. They both contribute to all scales in the inertial range, but exhibit different statistical behavior. We apply CVE to 256³ subcubes extracted from 3D homogeneous isotropic turbulent flows at different Taylor microscale Reynolds numbers (R»= 140,240 and 680), computed by a direct numerical simulation (DNS) at different resolutions (N = 256³,512³ and 2048³), respectively. We compare the total, coherent and incoherent vorticity fields obtained by using CVE and show that few wavelets coefficients are sufficient to represent the coherent vortices of the flows. Geometrical statistics in term of helicity are also analyzed and the »2 criterion is applied to the filtered flow fields. 2009 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46413562004 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.3 Vol.39 |
| format | Artículo científico |
| id | redalyc_46413562004 |
| institution | Redalyc |
| language | en |
| publishDate | 2009 |
| publisher | Sociedade Brasileira de Física |
| spellingShingle | Coherent Vorticity Extraction in 3D Homogeneous Isotropic Turbulence: Influence of the Reynolds Number and Geometrical Statistics Benjamin Kadoch Física, Astronomía y Matemáticas Wavelets coherent structures isotropic turbulence direct numerical simulation Coherent Vorticity Extraction in 3D Homogeneous Isotropic Turbulence: Influence of the Reynolds Number and Geometrical Statistics Benjamin Kadoch Margarete Oliveira Domingues Ingmar Broemstrup Lionel Larchevêque Kai Schneider Marie Farge Física, Astronomía y Matemáticas Wavelets coherent structures isotropic turbulence direct numerical simulation The coherent vorticity extraction method (CVE) is based on the nonlinear filtering of the vorticity field projected onto an orthonormal wavelet basis made of compactly supported functions. CVE decomposes each turbulent flow realization into two orthogonal components: a coherent and an incoherent random flow. They both contribute to all scales in the inertial range, but exhibit different statistical behavior. We apply CVE to 256³ subcubes extracted from 3D homogeneous isotropic turbulent flows at different Taylor microscale Reynolds numbers (R»= 140,240 and 680), computed by a direct numerical simulation (DNS) at different resolutions (N = 256³,512³ and 2048³), respectively. We compare the total, coherent and incoherent vorticity fields obtained by using CVE and show that few wavelets coefficients are sufficient to represent the coherent vortices of the flows. Geometrical statistics in term of helicity are also analyzed and the »2 criterion is applied to the filtered flow fields. 2009 artículo científico 0103-9733 https://www.redalyc.org/articulo.oa?id=46413562004 en http://www.redalyc.org/revista.oa?id=464 Brazilian Journal of Physics application/pdf Sociedade Brasileira de Física Brazilian Journal of Physics (Brasil) Num.3 Vol.39 |
| title | Coherent Vorticity Extraction in 3D Homogeneous Isotropic Turbulence: Influence of the Reynolds Number and Geometrical Statistics |
| topic | Física, Astronomía y Matemáticas Wavelets coherent structures isotropic turbulence direct numerical simulation |
| url | https://www.redalyc.org/articulo.oa?id=46413562004 |