nnd 中文意思是什麼

nnd 解釋
還是一個帖放不下
  1. Then the steady and unsteady subsonic, transonic and supersonic viscous flows around airfoil and some aircraft are numerically simulated. the 3 - dimensional unsteady navier - stokes equations are solved using the implicit lu - nnd algorithm, with baldwin - lomax turbulent model. on the basis of simulating unsteady viscous flow, coupling the structure dynamics equations, the problems of static aeroelasticity and flutter are investigated for wings and elevator

    在模擬非定常粘性繞流的基礎上，與顫振運動方程相耦合，分別對機翼和全機流固耦合現象中顫振問題進行了研究，準確求解跨音速顫振臨界速度，分析機翼和全機的從亞音速到超音速范圍的顫振規律，並研究分析了機翼飛行迎角變化對顫振速度的影響。
  2. Non - oscillatory and non - free - parameters dissipative ( nnd ) finite difference scheme ( a total variation diminishing scheme ) with second order accuracy was adopted to solve the fluid dynamic equations, a finite rate chemical reaction model was developed to calculate ingredient producing rate, and an adi over relaxation iteration technique was used to solve the electromagnetic discretized equations

    採用二階精度nnd格式求解流體力學方程組，採用有限速率化學反應模型計算組分生成率，採用交替方向隱式（ adi ）超鬆弛迭代法求解電磁場離散方程。
  3. The cell - centred finite volume algorithm, nnd finite volume algorithm and ausm + finite volume algorithm are studied for solving the euler equations, their abilities for hypersonic problem are studied especially

    本文分別對格心有限體積格式、 nnd有限體積格式和ausm +有限體積格式進行了研究，在求解euler方程的基礎上，研究了它們對跨音速以及高超聲速流場計算問題的解決能力。
  4. But the nnd algorithm can " t reach 2 - order precision, and the cell - centred finite volume algorithm is not suit to solve hypersonic problem. for the efficiency of the four - stage runge - kutta time - stepping scheme is low, and the robust is bad for the hypersonic problem, an implicit time - stepping scheme is adopted. this scheme can preserve the results precision and improve the computing efficiency sharply, and is an innovation for the time - stepping scheme of unstructured grid

    為了解決目前傳統四步龍格一庫塔時間推進效率較低、計算高超聲速流場時魯棒性較差的問題，本文改進並採用了一種隱式時間推進格式，能夠在保證精度要求的情況下有效的提高流場計算時的計算效率，對基於非結構網格的時間推進格式有了發展和創新。
  5. Nnd difference scheme divergences convection item and runge - kutta scheme iterates time item. the calculated outcome agrees well with the experiment data and analytic solution

    採用nnd差分格式離散對流項，時間迭代採用龍格庫塔法，計算結果與實驗值和解析解一致吻合。
  6. In this paper, we analyzed and discussed the basic principle of the recently developed high order accuracy finite difference schemes ? eno schemes and weno schemes. based on 2nd order nnd schemes, we introduced a 3rd order wnnd scheme with jiang and shu ' s " weighted " idea and a tvd runge - kutta time discretization method

    對于新近發展起來的eno格式和weno格式，本文分析並討論了其基本構造原理，並且在二階nnd格式的基礎上，利用jiang和shu的加權思想和具有tvd性質的runge - kutta時間離散方法，建立了時、空三階精度的wnnd格式。
  7. Through the paper " s study, the cell - centred finite volume algorithm and the 2 - order ausm + finite volume algorithm can solve the subsonic flow problem well ; the nnd finite volume algorithm and 2 - order ausm + finite volume algorithm can solve the hypersonic flow problem well

    研究表明，對于跨音速問題，格心以及二階ausm +格式解決的很好；對于高超聲速問題， nnd和ausm +格式解決的很好。
  8. High - resolution nnd scheme and fully implicit dual - time stepping method were adopted in the three - dimensional vibrating cascade flow calculation. thus, the correct simulation of the shock in transonic flow and the efficiency of calculation were both taken into consideration

    在三維振動葉柵流動數值模擬中，採用高解析度tvd類型的格式和全隱式雙時間方法，保證了對流動的正確模擬，準確地捕捉了跨音流動中的激波，其計算效率非常高。
  9. A new criterion for the accuracy of difference scheme at the shock is presented. it is proven that the nnd scheme meets the criterion strictly

    對差分格式在激波上計算準確性的標準提出了新的看法，並證明nnd格式完全符合這個標準。
  10. Abstract : a new criterion for the accuracy of difference scheme at the shock is presented. it is proven that the nnd scheme meets the criterion strictly

    文摘:對差分格式在激波上計算準確性的標準提出了新的看法，並證明nnd格式完全符合這個標準。
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