Basal Pressure Variations Induced by a Turbulent Flow Over a Wavy Surface
Turbulent flows over wavy surfaces give rise to the formation of ripples, dunes and other natural bedforms. To predict how much sediment these flows transport, research has focused mainly on basal shear stress, which peaks upstream of the highest topography, and has largely ignored the corresponding...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2021-05-01
|
| Series: | Frontiers in Physics |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fphy.2021.682564/full |
| _version_ | 1818453918681661440 |
|---|---|
| author | Philippe Claudin Michel Louge Bruno Andreotti |
| author_facet | Philippe Claudin Michel Louge Bruno Andreotti |
| author_sort | Philippe Claudin |
| collection | DOAJ |
| description | Turbulent flows over wavy surfaces give rise to the formation of ripples, dunes and other natural bedforms. To predict how much sediment these flows transport, research has focused mainly on basal shear stress, which peaks upstream of the highest topography, and has largely ignored the corresponding pressure variations. In this article, we reanalyze old literature data, as well as more recent wind tunnel results, to shed a new light on pressure induced by a turbulent flow on a sinusoidal surface. While the Bernoulli effect increases the velocity above crests and reduces it in troughs, pressure exhibits variations that lag behind the topography. We extract the in-phase and in-quadrature components from streamwise pressure profiles and compare them to hydrodynamic predictions calibrated on shear stress data. |
| first_indexed | 2024-12-14T21:46:37Z |
| format | Article |
| id | doaj.art-441f5302124640f49e687c4749c0350a |
| institution | Directory Open Access Journal |
| issn | 2296-424X |
| language | English |
| last_indexed | 2024-12-14T21:46:37Z |
| publishDate | 2021-05-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Physics |
| spelling | doaj.art-441f5302124640f49e687c4749c0350a2022-12-21T22:46:20ZengFrontiers Media S.A.Frontiers in Physics2296-424X2021-05-01910.3389/fphy.2021.682564682564Basal Pressure Variations Induced by a Turbulent Flow Over a Wavy SurfacePhilippe Claudin0Michel Louge1Bruno Andreotti2Physique et Mécanique des Milieux Hétérogènes, PMMH UMR 7636 CNRS, ESPCI Paris, PSL Research University, Université de Paris, Sorbonne Université, Paris, FranceSibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY, United StatesLaboratoire de Physique de L’Ecole Normale Supérieure, UMR 8550 CNRS, PSL Research University, Université de Paris, Sorbonne Université, Paris, FranceTurbulent flows over wavy surfaces give rise to the formation of ripples, dunes and other natural bedforms. To predict how much sediment these flows transport, research has focused mainly on basal shear stress, which peaks upstream of the highest topography, and has largely ignored the corresponding pressure variations. In this article, we reanalyze old literature data, as well as more recent wind tunnel results, to shed a new light on pressure induced by a turbulent flow on a sinusoidal surface. While the Bernoulli effect increases the velocity above crests and reduces it in troughs, pressure exhibits variations that lag behind the topography. We extract the in-phase and in-quadrature components from streamwise pressure profiles and compare them to hydrodynamic predictions calibrated on shear stress data.https://www.frontiersin.org/articles/10.3389/fphy.2021.682564/fullpressure modulationbedformssinusoidal topographylinear responselaminar-turbulent transition |
| spellingShingle | Philippe Claudin Michel Louge Bruno Andreotti Basal Pressure Variations Induced by a Turbulent Flow Over a Wavy Surface Frontiers in Physics pressure modulation bedforms sinusoidal topography linear response laminar-turbulent transition |
| title | Basal Pressure Variations Induced by a Turbulent Flow Over a Wavy Surface |
| title_full | Basal Pressure Variations Induced by a Turbulent Flow Over a Wavy Surface |
| title_fullStr | Basal Pressure Variations Induced by a Turbulent Flow Over a Wavy Surface |
| title_full_unstemmed | Basal Pressure Variations Induced by a Turbulent Flow Over a Wavy Surface |
| title_short | Basal Pressure Variations Induced by a Turbulent Flow Over a Wavy Surface |
| title_sort | basal pressure variations induced by a turbulent flow over a wavy surface |
| topic | pressure modulation bedforms sinusoidal topography linear response laminar-turbulent transition |
| url | https://www.frontiersin.org/articles/10.3389/fphy.2021.682564/full |
| work_keys_str_mv | AT philippeclaudin basalpressurevariationsinducedbyaturbulentflowoverawavysurface AT michellouge basalpressurevariationsinducedbyaturbulentflowoverawavysurface AT brunoandreotti basalpressurevariationsinducedbyaturbulentflowoverawavysurface |