Hence this method can improve accuracy and efficiency of the calculation . c . based on these work upwards , an adaptively wavelet precise time - invariant integration method was proposed in this paper . in this method , an adaptive multilevel interpolation wavelet collocation method for partial difference equations ( pdes ) was conducted , in which the time complexity is less than oleg v ' s method , and then the adaptive precise integration method was combined with , so that in this method the adaptively discretes both in time domain and physical domain were realized 该方法将外推法引入求解结构动力方程的精细时程积分法中，从而使该方法在求解非线性动力方程中可以自适应选取时间步长；需要指出的是，由于考虑了矩阵指数精细算法和外推法算法在时间离散方法上的一致性，在外推过程中，计算工作量基本没有增加；因此，两种方法的结合有效提高了算法的效率和精度。
Important missing aspects are : turbulent flow , numerical discretization techniques specially the relevant and difficult topic of numerical treatment of advection and related numerical methods of solution , variable property fluids , boundary layers , stability , etc . rather , it focuses on more primitive and fundamental issues of numerical treatment of advective equation and proper formulation of initial boundary value ( ib vp ) . numerical problems associated with advective dominated transport include spurious oscillation , numerical dispersion , peak clipping , and grid oriention . however , the key of numerical solution of three - dimensional advective problem is searching for a high - precision interpolating function , which can keep the computational stability and low damping 3 、针对三维纯对流方程提出了实用的拟协调单元模式，并与线性插值模式和协调单元模式比较后表明，在物理量大梯度变化的情况下，线性插值模式会产生较大的数值阻尼，导致解的失真；协调单元模式具有极高的计算精度和良好的计算稳定性，还可较好地克服数值阻尼，但由于计及物理量的二阶导数项，计算工作量大，边界条件给定尚存在一定的困难；而拟协调单元模式不仅具有协调单元模式计算精度高的优点，还避免了物理量的二阶导数项，可大大地减少计算工作量。
Secondly , based on frequency analysis and taken baishi reservoir as an example , study is carried out on extreme risk rate of limited water level dynamic control , which considers the security of dam and downstream protecting objects . case study shows that with the prerequisite of variant extreme risk index and limited water level , methods for computing and querying extreme risk rate is feasible . computing tune is consumedly reduced with graph solution , and gui offers a practical tool for decesion - makers . this method has extensive application potential to new built reservoirs without forecasing operation conditions 通过白石水库的实例研究表明，分别以不同极限风险率指标为前提、在不同汛期限制水位下起调洪水，其极限风险率的计算和查求方法是可行的；通过图解简化了水库调度运用时的计算工作量，亦可通过计算机交互界面，为决策者提供了一个切实可行的工具，方便决策者应用。对于那些新建、还不具备预报调度条件水库，本方法有推广应用价值。
However , the simulated annealing algorithm will expand too much time to estimate the values of objective function when applied to aerodynamics optimizations . the way to remedy this problem in this dissertation is by improving the efficiency of optimizer and the cfd - solver . our cfd - solver is base on the modification to the proper orthogonal decomposition ( pod ) method that can produce a finite series of basis functions or modes through the solution of snapshots 但对于气动外形优化设计问题来说,由于评估需要解决的问题的目标函数值需要多次调用流场解算器,会导致用模拟退火算法进行优化设计的计算工作量过大,因此需要我们对流场解算器和优化方法两个方面进行研究以寻找此问题的解决办法。
