|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Viscous numerical examination of hydrodynamic forces on a submerged horizontal circular cylinder undergoing forced oscillation显示文摘As a classical topic,the hydrodynamic forces on a submerged horizontal cylinder undergoing forced oscillation have been widely studied based on potential flow theory.However,the fluid viscosity and the flow rotation may play an important role when the oscillation amplitude of the circular cylinder is large,and large discrepancy will occur between the potential flow simulation and the experimental results.This study focuses on the study of hydrodynamic forces on a submerged horizontal circular cylinder undergoing forced oscillation by means of a viscous fluid numerical wave tank(NWT)model.The accuracy of the numerical model is validated against available experimental data.The comparisons between the hydrodynamic forces on the circular cylinder predicted by the viscous fluid model and the potential flow model are conducted to show the viscous effects on the hydrodynamic forces.By the study on the flow fields,the mechanism of the viscous effects is explained by the vortex effect.The basic reason for the difference between the results based on the viscous fluid theory and the potential flow theory is revealed by analyzing the force components. | Bin Teng Hong-fei Mao De-zhi Ning Chong-wei Zhang | 2019 | Journal of Hydrodynamics2019，31，5： | 4 |
| 2 | THE LOSS OF STABILITY OF LAMINAR FLOW IN OPEN CHANNEL AND THE MECHANISM OF SAND RIPPLE FORMATION显示文摘In the flow on a mobile bed in an open channel, sand ripple often appears after the sediment begins to move. Different scholars have different views on the formation of sand ripples. This paper holds that as the ripple in general is very small, its formation is due to the instability of the laminar flow or the evolution of the small-scale coherent structures in the sublayer adjacent to the wall of the open channel. When the shear stresses caused by the disturbing waves or the coherent structure near the bed surface boundary and the water flow itself are greater than the shields stresses, responses on the bed surface appear and the sand ripple forms. If the frequency of the shear stress caused by the disturbance is close to the natural frequency of the sand grains that produced resonance, such a phenomenon is called the 'detection property' of the sediment. It is at this point that the maximum resonance appears and the sand ripple develops rapidly. | BAI Yu-chuan(白玉川) LUO Ji-shen(罗纪生) | 2002 | Applied Mathematics and Mechanics(English Edition)2002，23，3： | 4 |
| 3 | Forced Oscillation of Neutral Advanced Dynamic Equations with Positive and Negative Coeffcients on Time Scales显示文摘In this paper,we consider the forced neutral advanced dynamic equations with positive and negative coeffcients[x(t)-R(t)x(t+r)]+P(t)x(t+τ)△Q(t)x(t+δ)= f(t),t≥t0 on a time scale T.Several suffcient conditions are obtained for the oscillation of the dynamic equations.The main result is illustrated by an example. | YANG Jun WU Hui-ning | 2011 | Chinese Quarterly Journal of Mathematics2011，26，3： | 1 |
| 4 | Hydrodynamics of the Semi-Immersed Cylinder by Forced Oscillation Model Testing显示文摘In this paper, the hydrodynamic coefficients of a horizontal semi-immersed cylinder in steady current and oscillatory flow combining with constant current are obtained via forced oscillation experiments in a towing tank. Three nondimensional parameters(Re, KC and Fr) are introduced to investigate their effects on the hydrodynamic coefficients.The experimental results show that overtopping is evident and dominates when the Reynolds number exceeds 5×105 in the experiment. Under steady current condition, overtopping increases the drag coefficient significantly at high Reynolds numbers. Under oscillatory flow with constant current condition, the added mass coefficient can even reach a maximum value about 3.5 due to overtopping while the influence of overtopping on the drag coefficient is minor. | SONG Chun-hui FU Shi-xiao TANG Xiao-ying HU Ke MA Lei-xin REN Tong-xin | 2018 | China Ocean Engineering2018，32，1： | 1 |
| 5 | A NUMERICAL STUDY OF SHORT-RANGE CLIMATIC OSCILLATION WITH VARIOUS TIME SCALES FORCED BY EL NINO DURING THE NORTHERN SUMMER显示文摘The normal mode method is adopted to decompose the differences between simulations with SST(seasurface temperature)anomahes over centra-eastern Pacific and normal SST by use of a nine-layer global spec-tral model in order to investigate short-range climatic oscillation with various time scales forced by ElNino during the northern summer.Investigation shows that El Nino may have the following influence onatmosphere on various space-time scales.Extra-long wave components of Rossby mode forced by convectiveanomaly over equatorial western Pacific resulting from El Nino produce climatic oscillation on monthly(sea-sonal)time scale in middle-high latitudes of Southern and Northern Hemispheres;extra-long wave componentsof Kelvin mode forced by SST anomalies propagate along the equator,resulting in 30—60 day oscillation oftropical and subtropical atmosphere;and its long waves move eastward with westerly,resulting in quasi-biweekoscillation. | 倪允琪 林武银 | 1990 | Acta meteorologica Sinica1990，4，3： | 1 |
| 6 | Kinetic Model Discrimination and Parameter Estimation via Unsteady.State Operation——Application of Karhunen-Loève Expansion | 戴迎春 陈良恒 袁渭康 | 1993 | Progress in Natural Science:Materials International1993，3，6： | 0 |
| 7 | FORCED OSCILLATIONS OF BOUNDARY VALUE PROBLEMS OF HIGHER ORDER FUNCTIONAL PARTIAL DIFFERENTIAL EQUATIONS显示文摘FORCEDOSCILLATIONSOFBOUNDARYVALUEPROBLEMSOFHIGHERORDERFUNCTIONALPARTIALDIFFERENTIALEQUATIONSJinMingZhong(靳明忠),DongYing(董莹),Li... | 靳明忠 董莹 李崇孝 | 1996 | Applied Mathematics and Mechanics(English Edition)1996，17，9： | 0 |
| 8 | A NUMERICAL STUDY FOR THE EFFECT OF TROPICAL 40—50 DAY OSCILLATION ON ASIAN SUMMER MONSOON显示文摘By using a five-layer primitive equation model with P-sigma coordinates, the effect of convective heatingsource with the oscillation of a dipole pattern over the tropical Indian Ocean-Western Pacific on Asian sum-mer monsoon is investigated. The results from simulations show that the oscillatary heating source maycause oscillations in east-west zonal circulation at the equator, in cross-equatorial flow, in meridionalmonsoon circulation and in the phase of high-low level circulation over Asia, with period same as that ofthe oscillating heat source. Furthermore, the influence mechanism of the tropical heating source associatedwith oscillations on Asian summer monsoon circulation is also studicd. It is clearly shown that the west-ward propagation of thermally-forced Rossy waves to the west of the oscillatary heating source and thenorthward propagation of disturbances can give rise to oscillations of the equatorial east-west zonal circula-tion and monsoonal meridional circulation. Finally, the oscillation of all the Asian summer monsoon cir-culation is formed. | 倪允琪 徐海明 蒙晓 | 1990 | Acta meteorologica Sinica1990，4，2： | 0 |
| 9 | Asymptotic Behavior and Oscillation for Forced Odd Order Neutral Differential Equations显示文摘Consider the forced odd order neutral differential equations of the | 陶有山 高国柱 | 2000 | Journal of China Textile University(English Edition)2000，17，3： | 0 |
| 10 | ASYMPTOTIC ANALYSIS OF WEAKLY NONLINEAR AND FORCED OSCILLATIONS显示文摘ASYMPTOTICANALYSISOFWEAKLYNONLINEARANDFORCEDOSCILLATIONSChenFeng(InstrumentAnalysisandTestingCenter,CentralSouthUniversityofT... | Chen Feng(Instrument Analysis and Testing Center, Central South University ofTechnology, Changsha 410083, China) | 1996 | Journal of Central South University1996，8，2： | 0 |
| 11 | FORCED OSCILLATION AND APPLICATION OF FUNCTIONAL DIFFERENTIAL INEQUALITIES显示文摘In this paper we study the oscillations for a class of functional differential inequalities. By using these properties some forced oscillations to the boundary value problems of functional partial differential equations are established. | 靳明忠 董莹 李崇孝 | 2002 | Annals of Differential Equations2002，18，3： | 0 |
| 12 | REACTION MECHANISM AND FORCED CONCENTRATION OSCILLATION CHARACTERISTICS OF BENZENE OXIDATION PROCESS显示文摘By combining results of transient response tests with forced concentration oscillation experi-ments,behaviors of benzene oxidation over V2O5 catalysts has been determined.Product increse canbe observed during periodic operation.The mechanism of catalytic reaction can be elucidated andthe behavior of concentration oscillation during the reaction is determined.The relation betweencycling frequency and response characteristics has also been studied with two different types of peri-odic operation,i.e.,regular and irregular square waves. | 张濂 朱海东 | 1993 | Chinese Journal of Chemical Engineering1993，1，1： | 0 |
| 13 | NOTES ON THE OSCILLATION FOR CERTAIN HYPERBOLIC EQUATIONS OF NEUTRAL TYPE显示文摘In this paper we concern a class of boundary value problem of delay hyperbolic equations, and obtain oscillation criteria for the solution of Eq.(E) satisfying boundary condition (B). | 冯黎波 王培光 | 2000 | Annals of Differential Equations2000，16，3： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员