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Development of a three dimensional circulation model based on fractional step method
Abualtayef, Mazen,Kuroiwa, Masamitsu,Sief, Ahmed Khaled,Matsubara, Yuhei,Aly, Ahmed M.,Sayed, Ahmed A.,Sambe, Alioune Nar The Society of Naval Architects of Korea 2010 International Journal of Naval Architecture and Oc Vol.2 No.1
A numerical model was developed for simulating a three-dimensional multilayer hydrodynamic and thermodynamic model in domains with irregular bottom topography. The model was designed for examining the interactions between flow and topography. The model was based on the three-dimensional Navier-Stokes equations and was solved using the fractional step method, which combines the finite difference method in the horizontal plane and the finite element method in the vertical plane. The numerical techniques were described and the model test and application were presented. For the model application to the northern part of Ariake Sea, the hydrodynamic and thermodynamic results were predicted. The numerically predicted amplitudes and phase angles were well consistent with the field observations.
Development of a three dimensional circulation model based on fractional step method
Mazen Abualtayef,Masamitsu Kuroiwa,Ahmed Khaled Seif,Yuhei Matsubara,Ahmed M. Aly,Alioune Nar Sambe 대한조선학회 2010 International Journal of Naval Architecture and Oc Vol.2 No.1
A numerical model was developed for simulating a three-dimensional multilayer hydrodynamic and thermodynamic model in domains with irregular bottom topography. The model was designed for examining the interactions between flow and topography. The model was based on the three-dimensional Navier-Stokes equations and was solved using the fractional step method, which combines the finite difference method in the horizontal plane and the finite element method in the vertical plane. The numerical techniques were described and the model test and application were presented. For the model application to the northern part of Ariake Sea, the hydrodynamic and thermodynamic results were predicted. The numerically predicted amplitudes and phase angles were well consistent with the field observations.
Predictive model for wave-induced currents and 3D beach evolution based on FAVOR Method
Kuroiwa, Masamitsu,Abualtayef, Mazen,Takada, Tetsushi,Sief, Ahmed Khaled,Matsubara, Yuehi The Society of Naval Architects of Korea 2010 International Journal of Naval Architecture and Oc Vol.2 No.2
The development of a numerical model using the fractional area/volume obstacle representation (FAVOR) method for predicting a nearshore current field bounded by complicated geometric shapes, and a three-dimensional (3D) beach evolution was described in this article. The 3D model was first tested against three cases to simulate the nearshore current fields around coastal structures, a river mouth, and a large scale cusp bathymetry. Then, the morphodynamic model tests, which are adopting the nearshore current model, were applied for the computations of beach evolution around a detached breakwater and two groins. It was confirmed that the presented model associated with the FAVOR method was useful to predict the nearshore current field in the vicinity of the complicated geometric shapes. Finally, the model was applied to a tombolo formation in a field site of Kunnui fishery port, which is located in Hokkaido, Japan.
Predictive model for wave-induced currents and 3D beach evolution based on FAVOR Method
Masamitsu Kuroiwa,Mazen Abualtayef,Tetsushi Takada,Ahmed Khaled Seif,Yuehi Matsubara 대한조선학회 2010 International Journal of Naval Architecture and Oc Vol.2 No.2
The development of a numerical model using the fractional area/volume obstacle representation (FAVOR) method for predicting a nearshore current field bounded by complicated geometric shapes, and a three-dimensional (3D) beach evolution was described in this article. The 3D model was first tested against three cases to simulate the nearshore current fields around coastal structures, a river mouth, and a large scale cusp bathymetry. Then, the morphodynamic model tests, which are adopting the nearshore current model, were applied for the computations of beach evolution around a detached breakwater and two groins. It was confirmed that the presented model associated with the FAVOR method was useful to predict the nearshore current field in the vicinity of the complicated geometric shapes. Finally, the model was applied to a tombolo formation in a field site of Kunnui fishery port, which is located in Hokkaido, Japan.
A hydrodynamic model of nearshore waves and wave-induced currents
Sief, Ahmed Khaled,Kuroiwa, Masamitsu,Abualtayef, Mazen,Mase, Hajime,Matsubara, Yuhei The Society of Naval Architects of Korea 2011 International Journal of Naval Architecture and Oc Vol.3 No.3
In This study develops a quasi-three dimensional numerical model of wave driven coastal currents with accounting the effects of the wave-current interaction and the surface rollers. In the wave model, the current effects on wave breaking and energy dissipation are taken into account as well as the wave diffraction effect. The surface roller associated with wave breaking was modeled based on a modification of the equations by Dally and Brown (1995) and Larson and Kraus (2002). Furthermore, the quasi-three dimensional model, which based on Navier-Stokes equations, was modified in association with the surface roller effect, and solved using frictional step method. The model was validated by data sets obtained during experiments on the Large Scale Sediment Transport Facility (LSTF) basin and the Hazaki Oceanographical Research Station (HORS). Then, a model test against detached breakwater was carried out to investigate the performance of the model around coastal structures. Finally, the model was applied to Akasaki port to verify the hydrodynamics around coastal structures. Good agreements between computations and measurements were obtained with regard to the cross-shore variation in waves and currents in nearshore and surf zone.
A hydrodynamic model of nearshore waves and wave-induced currents
Ahmed Khaled Seif,Masamitsu Kuroiwa,Mazen Abualtayef,Hajime Mase,Yuhei Matsubara 대한조선학회 2011 International Journal of Naval Architecture and Oc Vol.3 No.3
In This study develops a quasi-three dimensional numerical model of wave driven coastal currents with accounting the effects of the wave-current interaction and the surface rollers. In the wave model, the current effects on wave breaking and energy dissipation are taken into account as well as the wave diffraction effect. The surface roller associated with wave breaking was modeled based on a modification of the equations by Dally and Brown (1995) and Larson and Kraus (2002). Furthermore, the quasi-three dimensional model, which based on Navier-Stokes equations, was modified in association with the surface roller effect, and solved using frictional step method. The model was validated by data sets obtained during experiments on the Large Scale Sediment Transport Facility (LSTF) basin and the Hazaki Oceanographical Research Station (HORS). Then,a model test against detached breakwater was carried out to investigate the performance of the model around coastal structures. Finally, the model was applied to Akasaki port to verify the hydrodynamics around coastal structures. Good agreements between computations and measurements were obtained with regard to the cross-shore variation in waves and currents in nearshore and surf zone.