An exact representation of the nonlinear triad interaction terms in spectral space. (10th June 2014)

• Record Type: Journal Article
• Authors: Cheung, Lawrence C.; Zaki, Tamer A.
• Is Part Of: Journal of fluid mechanics. Volume 748(2014:Jun.)
• Page Start: 175
• Page End: 188
• Publication Date: 2014-06-10
• Subjects: Fluid mechanics -- Periodicals; 532.005
• DOI: 10.1017/jfm.2014.179
• Languages: English
• ISSNs: 0022-1120

Abstract

<abstract> <title>Abstract</title> <p>Spectral analysis of the Navier–Stokes equations requires treatment of the convolution of pairs of Fourier transforms <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgh190mnf01" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><tex-math><![CDATA[$\hat{f}$]]></tex-math></alternatives></inline-formula> and <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgh190mng4r" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><tex-math><![CDATA[$\hat{g}$]]></tex-math></alternatives></inline-formula>. An exact, tractable representation of the nonlinear terms in spectral space is introduced, and relies on the definition and manipulation of a combination matrix. A spectral energy equation is derived where the nonlinear triad interactions are expressed using the combination matrix. The formulation is applied to the problem of homogeneous, isotropic turbulence. By finding the solution in an appropriate canonical basis, the energy spectrum in the inertial range <inline-formula><alternatives><inline-graphic xlink:href="ark:/27927/pgh190mnj37" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /><tex-math><![CDATA[$E(k)\sim \epsilon ^{2/3}k^{-5/3}$]]></tex-math></alternatives></inline-formula> is derived from the Navier–Stokes equations without invoking dimensional scaling arguments.</p> </abstract>