摘要:

A theory which incorporates a surface spectrum of water waves is developed in such a way that direct computation and comparison with experiment is possible. Three theories are developed, one which applies to inviscid waves, one which applies to waves dominated by viscous conduction, and one which applies to waves dominated by viscous convection. It is found that the steady second-order streaming at the free surface increases by 20% if a sinusoidal wave is replaced by a Gaussian spectrum of standard deviation 4 radians per second of the same total energy.

ISSN:0022-1686    

DOI:10.1080/00221688109499520

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

The influence of wave steepness on force coefficient for large square and rectangular section caissons has been studied experimentally and compared with the results obtained using the modified linear diffraction theory proposed by Mogridge and Jamieson. The square caisson was tested for orientations of 0°, 15°, 30° and 45° of its side with the wave front and the rectangular caisson was tested for two aspect ratios of 3/4 and 4/3 for normal incidence of waves on its side.

ISSN:0022-1686    

DOI:10.1080/00221688109499521

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Results of experiments of friction losses in conduits with large roughnessformed by spheres and hemispheres in different concentrations are used as abasis for the determination of the reference datum. This enables the computationof the friction loss for this type of roughness without further experimentalwork. A mathematical model for the computation of friction coefficient, applicableto conduits with roughness elements of any shape and based on the coefficientof drag, is presented. The model has been successfully tested by experimentsin channels both with uniform and with random roughness size and shapeincluding experiments with natural river stones up to 150 mm high.

ISSN:0022-1686    

DOI:10.1080/00221688109499522

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Lines of hydrogen bubbles generated by electrolysis from a fine wire may be usedto visualise and quantify velocity fields in low velocity flow. Because thebubbles are released into the wake of the generating wire their velocity differsfrom that of the free stream. As the velocity deficit can amount to twentypercent of the free stream velocity at a distance of one hundred diameters fromthe wire, the wake effect cannot be ignored in quantative work. This paperexamines the influence of wire orientation, wire Reynolds number, bubble pulseduration and rate of bubble production on the velocity defect experienced bythe bubbles.

ISSN:0022-1686    

DOI:10.1080/00221688109499523

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

ISSN:0022-1686    

DOI:10.1080/00221688109499524

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

COMPUTER METHODS IN FLUIDS by K. MORGAN, C. TAYLOR and C. A. BREBBIAPentech Press, 4 Graham Lodge, Graham Road, London NW4 3DG, 408 pages, cloth binding, ISBN 727303090 - Price £ 20.

ISSN:0022-1686    

DOI:10.1080/00221688109499525

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

ISSN:0022-1686    

DOI:10.1080/00221688109499519

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor