second order deviation 中文意思是什麼

second order deviation 解釋
二階方差
  • second : adj 1 第二的;第二次的;二等(的)。2 次等的;較差的;劣於…的 (to)。3 〈美國〉較年輕的。4 另一...
  • order : n 1 次序,順序;整齊;(社會)秩序,治安;狀況,常態;健康狀態;條理;會場秩序;議事程序,日程;...
  • deviation : n 1 脫離,越軌,背離 (from) 。2 偏向,偏差。3 (統計上的)誤差。4 【航海】(故意)偏航。5 【數...
  1. According to the mathematic modeling principle of physical problem, the error of lattice boltzmann model is analyzed in chapter 3. the nonlinear deviation term from the navier - stokes equation is given, and the main model coefficients, such as speed of sound, viscosity and so on, are verified by numerical computation, the results show that the lattice boltzmann method has second order precision in space and in time which satisfy the engineering application, whereas, the compressible effect ca n ' t be neglected along with mach number increasing, and must be reduced or eliminated

    其次,按照物理問題數學建模的原則,對格子法的誤差進行了分析,給出了格子bgk方程再現navier - stokes方程時的壓縮誤差項,並數值驗證了格子模型的聲速及粘性系數等相關參數的精度,表明格子模型盡管具有時空二階精度,能滿足工程計算的要求,但隨著mach數增大,壓縮誤差逐漸成為主要誤差,必須予以消除。
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