The Experts below are selected from a list of 3198 Experts worldwide ranked by ideXlab platform
Rajneesh Bhardwaj - One of the best experts on this subject based on the ideXlab platform.
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role of skin Friction Drag during flow induced reconfiguration of a flexible thin plate
Journal of Fluids and Structures, 2018Co-Authors: Awan Bhati, Rajat Sawanni, Kaushik Kulkarni, Rajneesh BhardwajAbstract:Abstract We investigate Drag reduction due to the flow-induced reconfiguration of a flexible thin plate in presence of skin Friction Drag at low Reynolds Number. The plate is subjected to a uniform free stream and is tethered at one end. We extend existing models in the literature to account for the skin Friction Drag. The total Drag on the plate with respect to a rigid upright plate decreases due to flow-induced reconfiguration and further reconfiguration increases the total Drag due to increase in skin Friction Drag. A critical value of Cauchy number ( C a ) exists at which the total Drag on the plate with respect to a rigid upright plate is minimum at a given Reynolds number. The reconfigured shape of the plate for this condition is unique, beyond which the total Drag increases on the plate even with reconfiguration. The ratio of the skin Friction Drag Coefficient for a horizontal rigid plate and form Drag Coefficient for an upright rigid plate ( λ ) determines the critical Cauchy number ( C a c r ). We propose modification in the Drag scaling with free stream velocity ( F x ∝ U n ) in presence of the skin Friction Drag. The following expressions of n are found for 0 . 01 ≤ R e ≤ 1 , n = 4 ∕ 5 + λ ∕ 5 for 1 ≤ C a C a c r and n = 1 + λ ∕ 5 for C a c r ≤ C a ≤ 300 , where R e is Reynolds number. We briefly discuss the combined effect of the skin Friction Drag and buoyancy on the Drag reduction. An assessment of the feasibility of experiments is presented in order to translate the present model to physical systems.
Awan Bhati - One of the best experts on this subject based on the ideXlab platform.
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role of skin Friction Drag during flow induced reconfiguration of a flexible thin plate
Journal of Fluids and Structures, 2018Co-Authors: Awan Bhati, Rajat Sawanni, Kaushik Kulkarni, Rajneesh BhardwajAbstract:Abstract We investigate Drag reduction due to the flow-induced reconfiguration of a flexible thin plate in presence of skin Friction Drag at low Reynolds Number. The plate is subjected to a uniform free stream and is tethered at one end. We extend existing models in the literature to account for the skin Friction Drag. The total Drag on the plate with respect to a rigid upright plate decreases due to flow-induced reconfiguration and further reconfiguration increases the total Drag due to increase in skin Friction Drag. A critical value of Cauchy number ( C a ) exists at which the total Drag on the plate with respect to a rigid upright plate is minimum at a given Reynolds number. The reconfigured shape of the plate for this condition is unique, beyond which the total Drag increases on the plate even with reconfiguration. The ratio of the skin Friction Drag Coefficient for a horizontal rigid plate and form Drag Coefficient for an upright rigid plate ( λ ) determines the critical Cauchy number ( C a c r ). We propose modification in the Drag scaling with free stream velocity ( F x ∝ U n ) in presence of the skin Friction Drag. The following expressions of n are found for 0 . 01 ≤ R e ≤ 1 , n = 4 ∕ 5 + λ ∕ 5 for 1 ≤ C a C a c r and n = 1 + λ ∕ 5 for C a c r ≤ C a ≤ 300 , where R e is Reynolds number. We briefly discuss the combined effect of the skin Friction Drag and buoyancy on the Drag reduction. An assessment of the feasibility of experiments is presented in order to translate the present model to physical systems.
Cheng Cheng - One of the best experts on this subject based on the ideXlab platform.
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Decomposition of the mean skin-Friction Drag in compressible turbulent channel flows
Journal of Fluid Mechanics, 2019Co-Authors: Weipeng Li, Davide Modesti, Cheng ChengAbstract:The mean skin-Friction Drag in a wall-bounded turbulent flow can be decomposed into different physics-informed contributions based on the mean and statistical turbulence quantities across the wall layer. Following Renard & Deck’s study (J. Fluid Mech., vol. 790, 2016, pp. 339–367) on the skin-Friction Drag decomposition of incompressible wall-bounded turbulence, we extend their method to a compressible form and use it to investigate the effect of density and viscosity variations on skin-Friction Drag generation, using direct numerical simulation data of compressible turbulent channel flows. We use this novel decomposition to study the skin-Friction contributions associated with the molecular viscous dissipation and the turbulent kinetic energy production and we investigate their dependence on Reynolds and Mach number. We show that, upon application of the compressibility transformation of Trettel & Larsson (Phys. Fluids, vol. 28, 2016, 026102), the skin-Friction Drag contributions can be only partially transformed into the equivalent incompressible ones, as additional terms appear representing deviations from the incompressible counterpart. Nevertheless, these additional contributions are found to be negligible at sufficiently large equivalent Reynolds number and low Mach number. Moreover, we derive an exact relationship between the wall heat flux Coefficient and the skin-Friction Drag Coefficient, which allows us to relate the wall heat flux to the skin-Friction generation process.
Rajat Sawanni - One of the best experts on this subject based on the ideXlab platform.
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role of skin Friction Drag during flow induced reconfiguration of a flexible thin plate
Journal of Fluids and Structures, 2018Co-Authors: Awan Bhati, Rajat Sawanni, Kaushik Kulkarni, Rajneesh BhardwajAbstract:Abstract We investigate Drag reduction due to the flow-induced reconfiguration of a flexible thin plate in presence of skin Friction Drag at low Reynolds Number. The plate is subjected to a uniform free stream and is tethered at one end. We extend existing models in the literature to account for the skin Friction Drag. The total Drag on the plate with respect to a rigid upright plate decreases due to flow-induced reconfiguration and further reconfiguration increases the total Drag due to increase in skin Friction Drag. A critical value of Cauchy number ( C a ) exists at which the total Drag on the plate with respect to a rigid upright plate is minimum at a given Reynolds number. The reconfigured shape of the plate for this condition is unique, beyond which the total Drag increases on the plate even with reconfiguration. The ratio of the skin Friction Drag Coefficient for a horizontal rigid plate and form Drag Coefficient for an upright rigid plate ( λ ) determines the critical Cauchy number ( C a c r ). We propose modification in the Drag scaling with free stream velocity ( F x ∝ U n ) in presence of the skin Friction Drag. The following expressions of n are found for 0 . 01 ≤ R e ≤ 1 , n = 4 ∕ 5 + λ ∕ 5 for 1 ≤ C a C a c r and n = 1 + λ ∕ 5 for C a c r ≤ C a ≤ 300 , where R e is Reynolds number. We briefly discuss the combined effect of the skin Friction Drag and buoyancy on the Drag reduction. An assessment of the feasibility of experiments is presented in order to translate the present model to physical systems.
Kaushik Kulkarni - One of the best experts on this subject based on the ideXlab platform.
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role of skin Friction Drag during flow induced reconfiguration of a flexible thin plate
Journal of Fluids and Structures, 2018Co-Authors: Awan Bhati, Rajat Sawanni, Kaushik Kulkarni, Rajneesh BhardwajAbstract:Abstract We investigate Drag reduction due to the flow-induced reconfiguration of a flexible thin plate in presence of skin Friction Drag at low Reynolds Number. The plate is subjected to a uniform free stream and is tethered at one end. We extend existing models in the literature to account for the skin Friction Drag. The total Drag on the plate with respect to a rigid upright plate decreases due to flow-induced reconfiguration and further reconfiguration increases the total Drag due to increase in skin Friction Drag. A critical value of Cauchy number ( C a ) exists at which the total Drag on the plate with respect to a rigid upright plate is minimum at a given Reynolds number. The reconfigured shape of the plate for this condition is unique, beyond which the total Drag increases on the plate even with reconfiguration. The ratio of the skin Friction Drag Coefficient for a horizontal rigid plate and form Drag Coefficient for an upright rigid plate ( λ ) determines the critical Cauchy number ( C a c r ). We propose modification in the Drag scaling with free stream velocity ( F x ∝ U n ) in presence of the skin Friction Drag. The following expressions of n are found for 0 . 01 ≤ R e ≤ 1 , n = 4 ∕ 5 + λ ∕ 5 for 1 ≤ C a C a c r and n = 1 + λ ∕ 5 for C a c r ≤ C a ≤ 300 , where R e is Reynolds number. We briefly discuss the combined effect of the skin Friction Drag and buoyancy on the Drag reduction. An assessment of the feasibility of experiments is presented in order to translate the present model to physical systems.
