Numerical investigation on irregular wave bottom boundary layer under laminar motion

M. A. Samad, Hitoshi Tanaka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Laminar plane bed bottom boundary layer properties under irregular waves have been investigated through numerical computation. Irregular waves have first been generated and later used for flow computation in the boundary layer applying Jones and Launder original low Reynolds number k-ε model. Generation of irregular waves show satisfactory result when compared with input spectral properties. Model results have been compared with experiment data and an excellent agreement has been obtained. Results from different Reynolds number conditions have been utilized for detailed analysis of bottom shear stress variation with free stream velocity. It has been observed that bottom shear stress is more dominated by high frequency component waves. High flow inertia close to the bottom also causes a double peaked structure in the bottom shear stress, a rather unique feature in irregular waves. A comparison of irregular wave bottom shear stress with that of sinusoidal wave shows that the significant bottom shear stress closely corresponds to the maximum of sinusoidal wave when the later is computed with the highest two-fifth of wave heights (H(2/5)) of the former.

Original languageEnglish
Title of host publicationCoastal engineering and marina developments.Proceedings of the 4th international conference on computer modelling of seas and coastal regions. Lemnos, May 1999.
EditorsC.A. Brebbia, P. Anagnostopoulos, C.A. Brebbia, P. Anagnostopoulos
PublisherWITPress
Pages193-202
Number of pages10
ISBN (Print)1853126861
Publication statusPublished - 1999 Dec 1
EventProceedings of the 4th international conference on computer modellling of seas and oceans. Coastal engineering and marina developments '99. - Lemnos, Greece
Duration: 2099 May 12099 May 1

Other

OtherProceedings of the 4th international conference on computer modellling of seas and oceans. Coastal engineering and marina developments '99.
Country/TerritoryGreece
CityLemnos
Period99/5/199/5/1

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Engineering(all)
  • Environmental Science(all)

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