Simulation Verification Of Numerical Flume Based On Theory Of The Minimum Rate Of Energy Dissipation

Theory of the minimum rate of energy dissipation was first proposed in1868bythe German physicist Helmholtz,applied to a solid wall, clearwater and irrotationaluniformflow, it has been referred to as the extreme hypothesis about rate of energydissipation. In the early1950s Βeликанов Μ.Α. applied it to movable bedsediment-laden flow. Yang C.T. and Chang H.H. etc made great progress and made alot of achievements in the minimum rate of energy dissipation in1970s,.Theminimum rate of energy dissipation has been rigorous theory to be proved, but lackingof a large number of measured data and numerical simulation to proof it. RNG k-ε turbulence model and GMO model of Flow3D were applied to simulate fluid motionin the straight rectangular flume. Selecting the fluid between the different sections assystem to study, the instantaneous rate of energy dissipation of per unit volume fluidof the system was calculated. The results show that fluid motion in the rectangulartank follows theory of the minimum rate of energy dissipation. The factors affectingthe rate of energy was studied, for example, velocity, roughness and sink outlet end ofthe rotational angular velocity applied process. The results show that:(1) The greater the velocity the greater unit volume of water energy consumptionrate and the greater the velocity the greater the rate of change of the rate of energydissipation, more water energy consumption tends uniformly distributed along theway.(2)The greater the roughness the greater the energy consumption rate, but will notaffect the overall trend. And roughness affect the length of time for the unsteady stateof the water body into a constant state.(3)The process of the rotational angular velocity applied to sink outlet affect therate of energy dissipation as follows: Corresponding to the various rotary angularvelocity trend of the rate of energy and the angular velocity of the applying process,when the respective rotational angular velocity reaches its maximum, also thismoment reaches a minimum rate of energy dissipation. At the same time, due to theangular velocity is applied process is different, so the size of the angular velocityvalues, the greater the value of the angular velocity and the greater the rate of energycorresponding to this moment.