Author: Robert L. AshPublisher:
ISBN:
Category : Drag (Aerodynamics)
Languages : en
Pages : 82
Book Description
On the Theory of Compliant Wall Drag Reduction in Turbulent Boundary Layers
Author: Robert L. AshPublisher:
ISBN:
Category : Drag (Aerodynamics)
Languages : en
Pages : 82
Book Description
On the Theory of Compliant Wall Drag Reduction in Turbulent Boundary Layers
Author: Robert L. AshPublisher:
ISBN:
Category : Drag (Aerodynamics)
Languages : en
Pages : 52
Book Description
Viscous Drag Reduction in Boundary Layers
Author: Publisher: AIAA
ISBN: 9781600863783
Category : Boundary layer
Languages : en
Pages : 542
Book Description
On the Theory of Compliant Wall Drag Reduction in Turbulent Boundary Layers
Author: Robert L. AshPublisher:
ISBN:
Category : Drag (Aerodynamics)
Languages : en
Pages : 52
Book Description
Drag Reduction Effects in Turbulent Boundary Layers Over Wavy Walls
Author: Ramakrishna BalasubramanianPublisher:
ISBN:
Category : Navier-Stokes equations
Languages : en
Pages : 126
Book Description
Prediction of Compliant Wall Drag Reduction
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781724680730
Category :
Languages : en
Pages : 32
Book Description
A numerical model of turbulent boundary layer flows over compliant walls was investigated. The model is based on Burton's observation that outer flow structures in turbulent boundary layers produce large scale pressure fluctuations near the wall. The results of calculations indicate that certain small wavelength wall motions can have a significant effect upon the stability of turbulent boundary layers. Orszag, S. A. Unspecified Center NASA-CR-3071 NAS1-14906
Turbulent Boundary Layer Drag Reduction Using an Oscillating Wall
Author: Steven M. TrujilloLaminar Turbulent Boundary Layers
Author: American Society of Mechanical Engineers. Multiphase Flow CommitteePublisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 194
Book Description
Behavior of Turbulent Boundary Layers on Curved Convex Walls
Author: Hans SchmidbauerPublisher:
ISBN:
Category : Mathematics
Languages : en
Pages : 570
Book Description
The system of linear differential equations which indicated the approach of separation and the so-called "boundary-layer thickness" by Gruschwitz is extended in this report to include the case where the friction layer is subject to centrifugal forces. Evaluation of the data yields a strong functional dependence of the momentum change and wall drag on the boundary-layer thickness radius of curvature ratio for the wall. It is further shown that the transition from laminar to turbulent flow occurs at somewhat higher Reynolds Numbers at the convex wall than at the flat plate, due to the stabilizing effect of the centrifugal forces.
Recent Developments in Turbulence Management
Author: K.-S. ChoiPublisher: Springer Science & Business Media
ISBN: 9401135266
Category : Technology & Engineering
Languages : en
Pages : 344
Book Description
The European Drag Reduction Meeting has been held on 15th and 16th November 1990 in London. This was the fifth of the annual European meetings on drag reduction in engineering flows. The main objective of this meeting was to discuss up-to-date results of drag reduction research carried out in Europe. The organiser has adopted the philosophy of discussing the yesterday's results rather than the last year's results. No written material has therefore been requested for the meeting. It was only after the meeting the submission of papers was requested to the participants, from which 16 papers were selected for this proceedings volume. The meeting has attracted a record number of participants with a total of 52 researchers from seven European countries, U. K. , France, Germany, the Netherlands, Italy, Switzerland and U. S. S. R. as well as from Japan, Canada and Australia. The subjects covered in this proceedings volume include riblets, LEBUs (Large Eddy Break-Up device), surface roughness, compliant surfaces and polymer additives. Riblets seem to be one of the most extensively studied devices in the past years. Reflecting this situation in the European community, there are six papers on riblets covering their practical applications to aircraft and to a model ship, near-wall coherent structure of the boundary layer and effects of flow three-dimensionality. Possibility of heat-transfer enhancement with riblets and potential use in the laminar flow are also investigated. An analytical model is developed for the boundary-layer with a LEBU device.