tvd 中文意思是什麼

tvd 解釋
全變差遞減
  1. The results show that it is the numerical method of high analyzable degree for the hybrid tvd scheme combinated with fvm, and the scheme is not only sufficiently accurate and nonoscillatory, but also capable of treating automatically hydraulic jump

    算例驗證表明：應用組合型tvd ? muscl格式配合有限體積法是一種高解析度的數值方法，且tvd ? muscl格式對于自動捕捉激波和抑制間斷附近的數值解波動十分有效，它對間斷具有高解析度。
  2. Shock tube ; conical convergent section ; detonation ; finite volume tvd scheme

    激波管收縮截面爆轟有限體積tvd格式
  3. The numerical simulation of axisymmetric two - dimensional shock tube is studied, which has a conical convergent section, and its driving gas is the hot product of hydrogen oxygen detonation. finite volume tvd scheme is adopted and the mesh is local orthogonal. the primitive equations are euler s equations of multi - component flow. the new method of eliminating numerical oscillation at the interface of two materials is extended to two dimensions. the mechanical character of this shock tube is analyzed

    對由前向爆轟產生驅動氣體並具有局部錐形收縮截面的軸對稱激波管利用兩相常比熱完全氣體的歐拉方程組和有限體積tvd格式在局部正交的網格上進行了二維數值模擬。將消除兩種介質界面處數值振蕩的新方法成功地推廣到二維情況。分析了該激波管的力學特性。
  4. The control - equations were solved with upwind tvd algorithm and elemental chemical reaction model, with the point - implicit used to overcome the numerical stiffness of chemical reaction source term

    數值結果顯示，當爆轟波平掠過惰性氣體界面時，形成了爆轟波、界面、透射激波以及稀疏波相互作用的現象。
  5. The finite - rate combustion kinetic model for standing oblique detonation waves is established. the tvd finite volume scheme is also presented. the combustion flow fields of standing oblique detonation waves are numerically simulated using 7 species and 8 reaction steps hydrogen combustion model, 10 species and 12 reaction steps methane combustion model respectively

    建立了適合多組分含有限速率化學反應流體流動的數學模型，構造了多組分化學反應流體流動守恆方程的tvd有限體積數值格式，採用7組分8反應的氫燃燒， 10組分12反應甲烷燃燒的化學反應機理，數值模擬了駐定斜爆轟波燃燒流場，取得了較好的結果。
  6. In rotating frame of reference, the construction method of three dimensional finite volume tvd schemes is systemically analyzed, in which implicit euler defiference is applied for time discretization

    在旋轉坐標系下，發展了一種含旋轉源項的雷諾平均navier - stokes方程的三維有限體積tvd格式，時間離散採用隱式euler方法。
  7. In this paper, in order to find the approaches to reduce the drag levels and enhance the lift - drag ratio for grid fin, the aerodynamic characteristics of the grid fin are calculated with tvd finite volume scheme and wind tunnel tests. according to the complex flow field, a curve - long parameter grid generation technique is applied, and the density of the grid is processed

    為適應復雜流場的數值計算，對網格生成方法進行了研究，採用弧長網格生成法進行貼體網格生成，並對網格進行了加密處理，使物面附近網格盡量密些，而在遠場使網格盡量稀疏些。
  8. In order to apply the central scheme to higher mach number flows, the sensor about pressure or temperature are modified with some tvd - like properties. modification to van leer scheme about the energy component can preserve a constant total enthalpy in the steady flows

    對vanleer格式中的能量分裂式進行改進，使其在定常流動中總焓守恆；採用統一的通量矢量函數，最大程度地實現了流場程序向量化，計算效率得以提高。
  9. The tvd and maccormack schemes are employed to deal with gas and particle equation respectively

    用tvd格式和maccormack格式分別求解氣相方程和顆粒相方程。
  10. 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。
  11. Based on former work, a finite difference viscous code that uses a high convergence, high accuracy, high resolution lu - sgs - ge implicit scheme and an improved fourth ( fifth ) - order high resolution muscl tvd scheme to integrate the full 3d navier - stokes equations and the low - reynolds number two - equation turbulence model is extended to simulate the flow field inside centrifugal impeller mechanism

    並且在現有工作基礎之上，將基於有限差分方法的高收斂率、高精度、高解析度的lu - sgs - ge隱式格式和四（五）階muscltvd格式求解全三維navier - stokes方程和低雷諾數雙方程湍流模型的計算程序推廣到離心葉輪機械內部流場的數值求解。
  12. Scramjet inlet is of great importance in the hypersonic airbreathing propulsion system and plays significant role in the realization of hypersonic flight. full 3 - dimensinal n - s equations are solved by using finite volume method, second - order harten - tvd spatial scheme, and algebraic baldwin - lomax turbulence model

    本文基於favre質量加權平均的三維navier - stokes方程，採用有限體積法、二階的tvd格式進行流場求解，並使用了bladwin - lomax代數湍流模型。
  13. In forth chapter, several difference methods that are suitable for solution of quasilinear equation are presented, namely, one step lax - wendroff scheme, two step lax - wendroff scheme, mac cormark scheme, tvd scheme, harten tvd scheme with two - order precision. all of them are applied to simulate the same traffic - flow question and choose the best scheme under the consideration of their results. in fifth chap ter, power function traffic - flow model and harten tvd scheme with two - order precision are applied to simulate red - green signal traffic - flow, including isolated, synchronous and synchronous changing red - green signal case

    在第4章中，給出了適于求解擬線性方程的幾種差分格式，即一步lax - wendroff格式、二步lax - wendroff格式、 maccormark格式、一階tvd格式、 harten二階tvd格式，並用上述5種格式對同一簡單的交通流問題進行了數值模擬，利用數值結果，篩選出最適合求解具有強間斷特性的交通流問題harten二階tvd格式。
  14. Tvd : true vertical depth

    定向井的垂直深度
  15. On the basis of fvm and unstructured grids, tvd ? muscl scheme is constructed with high performance. according to the discharge and water level of breach, the scheme is used to compute velocity and water level of center node of all elements

    在應用有限體積法無結構網格的基礎上建立了高性能的tvd ? muscl格式，根據堤壩潰口處的流量、水位，計算出沿程下游各點的流速、水位。
  16. Using time splitted algorithm, the convection term is solved with tvd method and the chemical reaction is dealt with elementary reaction model

    對流項和化學反應項採用時間分裂法，分別用tvd格式和基元反應模型進行處理。
  17. The numerical solutions obtained in computation of riemann problem are satisfied. hyperbolic conservation laws with stiff source terms could describe the effect of relaxation as in the kinetic theory of gases, water waves and traffic flows, etc. the gauss schemes with staggered grids for hyperbolic conservation laws are applied to solve hyperbolic conservation laws with stiff source terms, a class high resolution schemes for hyperbolic conservation laws with stiff source terms are presented. these schemes are the second order accurate and tvd under the restriction of cfl condition, convergence of these schemes are proved

    本文將求解雙曲守恆律方程的交錯網格的gauss型差分格式，應用於求解含有剛度源項的雙曲守恆律，構造了一類具有高分辨，計算簡便等優點的求解含有剛度源項的雙曲守恆律的交錯網格的gauss型差分格式，證明該格式為一致二階精度的格式，證明了該格式在cfl條件限制下為tvd格式，並證明了該格式的收斂性。
  18. For applications involving shocks, second order schemes such as tvd schemes are usually adequate if only relatively simple structures are present in the smooth part of the solution. however, high order shock capturing schemes ( order of at least three ) are more efficient than low order schemes when a problem contains rich structures as well as schocks

    在計算含有激波但光滑區不存在復雜波系結構的流場時，二階差分格式如tvd類格式已能夠得到比較理想的數值計算結果；然而，對于即含激波，光滑區又富含各種波系結構的流場，高階高精度格式的激波捕捉格式相對低階格式具有更高的解析度，更能夠反映流場的真實流動。
  19. A high accuracy, high resolution numerical method ( lu - sgs - ge scheme and 4th order muscl tvd scheme ) is applied to calculate the unsteady flow field

    在計算網格移動下的非定常流場時採用了高精度、高解析度的數值計算方法? ? lu - sgs - ge隱式格式和高階muscltvd格式。
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