dc.contributor.author | Grigoriadis, D. G. E. | en |
dc.contributor.author | Dimas, A. A. | en |
dc.contributor.author | Balaras, E. | en |
dc.creator | Grigoriadis, D. G. E. | en |
dc.creator | Dimas, A. A. | en |
dc.creator | Balaras, E. | en |
dc.date.accessioned | 2019-05-06T12:23:39Z | |
dc.date.available | 2019-05-06T12:23:39Z | |
dc.date.issued | 2012 | |
dc.identifier.uri | http://gnosis.library.ucy.ac.cy/handle/7/48384 | |
dc.description.abstract | Large-eddy simulation (LES) of turbulent boundary layer induced by external oscillatory flow without or with a unidirectional component over rippled bottom is presented. These flows represent prototype turbulent flows of wave-current interactions in the coastal zone. The numerical method is based on a time-splitting scheme for the temporal discretization and a finite-differences approximation on orthogonal grid for the spatial discretization. The immersed boundary (IMB) method is utilized to represent complex boundary shapes, i.e., the rippled bed, on the orthogonal grid. Results are presented for oscillatory flow over ripples of three steepness values and for oscillatory-unidirectional flow of two current magnitudes, including comparisons to available experimental data. In general, the effect of ripple steepness on flow separation, vorticity dynamics, turbulence, wall stress and drag is found to be strong, while the corresponding effect of current relative strength is weak. Finally, the wave friction factor, for the oscillatory flow cases, is computed and, thus, the effective Nikuradse roughness of the rippled bed is evaluated. © 2011 Elsevier B.V. | en |
dc.language.iso | eng | en |
dc.source | Coastal Engineering | en |
dc.subject | Experimental data | en |
dc.subject | Numerical methods | en |
dc.subject | Turbulent flow | en |
dc.subject | Turbulence | en |
dc.subject | Computational fluid dynamics | en |
dc.subject | spatial analysis | en |
dc.subject | Boundary layers | en |
dc.subject | Atmospheric thermodynamics | en |
dc.subject | Immersed boundary methods | en |
dc.subject | Large eddy simulation | en |
dc.subject | Oscillatory flows | en |
dc.subject | Spatial discretizations | en |
dc.subject | Temporal discretization | en |
dc.subject | Current magnitudes | en |
dc.subject | Immersed boundary | en |
dc.subject | Immersed boundary method | en |
dc.subject | Turbulent boundary layers | en |
dc.subject | Wave current interaction | en |
dc.subject | bed roughness | en |
dc.subject | Boundary shapes | en |
dc.subject | coastal zone | en |
dc.subject | Coastal zones | en |
dc.subject | experimental study | en |
dc.subject | Finite difference | en |
dc.subject | Orthogonal grid | en |
dc.subject | oscillating flow | en |
dc.subject | Relative strength | en |
dc.subject | ripple | en |
dc.subject | Rippled bed | en |
dc.subject | Time splitting | en |
dc.subject | Turbulence large-eddy simulation | en |
dc.subject | Turbulent boundary layer | en |
dc.subject | vorticity | en |
dc.subject | Vorticity dynamics | en |
dc.subject | Wall Stress | en |
dc.subject | wave force | en |
dc.subject | Wave friction factor | en |
dc.subject | Wave-current boundary layer | en |
dc.subject | wave-current interaction | en |
dc.title | Large-eddy simulation of wave turbulent boundary layer over rippled bed | en |
dc.type | info:eu-repo/semantics/article | |
dc.identifier.doi | 10.1016/j.coastaleng.2011.10.003 | |
dc.description.volume | 60 | |
dc.description.startingpage | 174 | |
dc.description.endingpage | 189 | |
dc.author.faculty | Πολυτεχνική Σχολή / Faculty of Engineering | |
dc.author.department | Τμήμα Μηχανικών Μηχανολογίας και Κατασκευαστικής / Department of Mechanical and Manufacturing Engineering | |
dc.type.uhtype | Article | en |
dc.contributor.orcid | Grigoriadis, D. G. E. [0000-0002-8961-7394] | |
dc.description.totalnumpages | 174-189 | |
dc.gnosis.orcid | 0000-0002-8961-7394 | |