The 3-D complex turbulent flow fields in a plunge pool with arciform bottom are simulated by using the k-Ε model in body-fitted coordinates. The calculated results reveal the flow characteristics in the arciform plun...The 3-D complex turbulent flow fields in a plunge pool with arciform bottom are simulated by using the k-Ε model in body-fitted coordinates. The calculated results reveal the flow characteristics in the arciform plunge pool under the different flood discharge conditions, which can not be easily obtained in the physical model test because the measurement of the complex velocity is very difficult. The calculated flow fields are helpful to understand the hydraulic characteristics of plunge pool deeply. The calculated and the measured pressure distributions on the pool bottom are compared and in good agreement.展开更多
Compared with general trapeziform plunge pools, an arciform plunge pool has its advantages, e.g. less excavate quantity, higher stability, etc. In this paper, the hydrodynamic pressure distribution on the soleplate of...Compared with general trapeziform plunge pools, an arciform plunge pool has its advantages, e.g. less excavate quantity, higher stability, etc. In this paper, the hydrodynamic pressure distribution on the soleplate of the arciform plunge pool is measured under a relatively dangerous condition of operation. The result is helpful to the design of the arciform plunge pool. The result also shows that the difference between the maximum and the minimum pressures on the upward surface of the soleplate may cause an additional uplift force on the soleplate under certain condition and should be taken into consideration in the uplift force calculation of the soleplate. The scour experiment verifies the higher stability of the arciform plunge pool.展开更多
The problem of free surface is one of main difficulties in the numerical calculation of turbulent flow. This paper presents the concept of 'elastic-lid' for the first time, which is used to calculate the stead...The problem of free surface is one of main difficulties in the numerical calculation of turbulent flow. This paper presents the concept of 'elastic-lid' for the first time, which is used to calculate the steady turbulent flow domains with complex free surfaces. This method can be combined with the existing steady turbulence models. Compared with MAC and other unsteady methods, it is simpler and can give us the parameters related to turbulent flow. The method is supported by the techniques of 'block-off' and 'elastic-grid', which can be selected for different problems. Finally, three examples are given to show the application of the 'elastic-lid' method. The calculated results are in good agreement with the measured.展开更多
文摘The 3-D complex turbulent flow fields in a plunge pool with arciform bottom are simulated by using the k-Ε model in body-fitted coordinates. The calculated results reveal the flow characteristics in the arciform plunge pool under the different flood discharge conditions, which can not be easily obtained in the physical model test because the measurement of the complex velocity is very difficult. The calculated flow fields are helpful to understand the hydraulic characteristics of plunge pool deeply. The calculated and the measured pressure distributions on the pool bottom are compared and in good agreement.
文摘Compared with general trapeziform plunge pools, an arciform plunge pool has its advantages, e.g. less excavate quantity, higher stability, etc. In this paper, the hydrodynamic pressure distribution on the soleplate of the arciform plunge pool is measured under a relatively dangerous condition of operation. The result is helpful to the design of the arciform plunge pool. The result also shows that the difference between the maximum and the minimum pressures on the upward surface of the soleplate may cause an additional uplift force on the soleplate under certain condition and should be taken into consideration in the uplift force calculation of the soleplate. The scour experiment verifies the higher stability of the arciform plunge pool.
文摘The problem of free surface is one of main difficulties in the numerical calculation of turbulent flow. This paper presents the concept of 'elastic-lid' for the first time, which is used to calculate the steady turbulent flow domains with complex free surfaces. This method can be combined with the existing steady turbulence models. Compared with MAC and other unsteady methods, it is simpler and can give us the parameters related to turbulent flow. The method is supported by the techniques of 'block-off' and 'elastic-grid', which can be selected for different problems. Finally, three examples are given to show the application of the 'elastic-lid' method. The calculated results are in good agreement with the measured.
