EXPERIMENTAL AND NUMERICAL STUDY OF WAVES IN POROUS STRUCTURE

摘要

Hydraulic characteristics of oscillatory flow in an idealized porous structure (verticalrnpermeable structure with an impermeable rear wall) are studied experimentally andrnnumerically. Wave height distributions inside the structure and in front of the rear wallrnare investigated for different wave and structural conditions. It is observed that wavernheight inside the structure decreases exponentially for any structural and/or incident waverncondition. An empirical relationship is developed for the wave height at the rear wall inrnterms of incident wave condition and structure width. The empirical relationship isrnverified with experimental data and numerical results. Reflection characteristics for thernstructure of different widths and porosities are investigated. The relative width of thernstructure associated with the formation of standing wave is the important parameter forrnthe degree of wave reflection. A numerical model for two-dimensional flow is validatedrnfor the similar setup of experimental studies. The model is applied to simulate the waverncharacteristics inside and outside the porous structure. It is confirmed that there existsrnoptimum structure width for which wave reflection is minimum.