On physical optics approximation of viscous stratified shear flows
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arXiv
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| Format: | Preprint |
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2019
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| _version_ | 1866917696653754368 |
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| author | Karjanto, N. |
| author_facet | Karjanto, N. |
| contents | We study a mathematical model of a perturbed stratified shear mean flow in the presence of eddy coefficients of turbulent viscosity. We adopt the standard Boussinesq approximation in the natural convection of the buoyancy-driven flow and neglect the influence of the eddy coefficients of turbulent diffusivity. Comprising both the vertical and horizontal viscosity effects, a model for the vertical velocity perturbation corresponds to a fourth-order Taylor-Goldstein (TG) differential equation. Considering only the latter, we obtained a modified TG equation with the same order as the classical, inviscid one. Under an assumption of the slowly varying Brunt-Väisälä frequency and background horizontal velocity, we discuss the corresponding geometrical and physical optics approximations of the modified TG equation using the WKB method. We further investigate the behavior of these asymptotic solutions near singular values of a turning point and critical level. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_1908_05457 |
| institution | arXiv |
| publishDate | 2019 |
| record_format | arxiv |
| spellingShingle | On physical optics approximation of viscous stratified shear flows Karjanto, N. Atmospheric and Oceanic Physics Fluid Dynamics 76B15, 76B55, 76B60, 86A10, 76E20, 34E20, 34E05 We study a mathematical model of a perturbed stratified shear mean flow in the presence of eddy coefficients of turbulent viscosity. We adopt the standard Boussinesq approximation in the natural convection of the buoyancy-driven flow and neglect the influence of the eddy coefficients of turbulent diffusivity. Comprising both the vertical and horizontal viscosity effects, a model for the vertical velocity perturbation corresponds to a fourth-order Taylor-Goldstein (TG) differential equation. Considering only the latter, we obtained a modified TG equation with the same order as the classical, inviscid one. Under an assumption of the slowly varying Brunt-Väisälä frequency and background horizontal velocity, we discuss the corresponding geometrical and physical optics approximations of the modified TG equation using the WKB method. We further investigate the behavior of these asymptotic solutions near singular values of a turning point and critical level. |
| title | On physical optics approximation of viscous stratified shear flows |
| topic | Atmospheric and Oceanic Physics Fluid Dynamics 76B15, 76B55, 76B60, 86A10, 76E20, 34E20, 34E05 |
| url | https://arxiv.org/abs/1908.05457 |