高階精度 的英文怎麼說

中文拼音 [gāojiējīngdù]
高階精度 英文
higher order accuracy
  • 高 : Ⅰ形容詞1 （從下向上距離大; 離地面遠） tall; high 2 （在一般標準或平均程度之上; 等級在上的） above...
  • 階 : 名詞1. （臺階） steps; stairs 2. （等級） rank 3. [醫學] （耳蝸的三個螺旋管的任一個） scala 4. [數學] order 5. [地質學] stage
  • 精 : Ⅰ形容詞1 （經過提煉或挑選的） refined; picked; choice 2 （完美;最好） perfect; excellent 3 （細）...
  • 度 : 度動詞[書面語] （推測; 估計） surmise; estimate
  • 高階 : high [higher] order高階導數 higher derivative; higher order derivative; derivative of higher orde...
  • 精度 : precision; accuracy; degree of accuracy; precision accuracy; trueness
  1. A composite 4 - th order adams - bashforth - moulton scheme is used to solve the equations. with this higher - order scheme, the accuracy of numerical computation results is well ensured

    採用四階精度的abm預測-校正差分格式，基本滿足了高階boussinesq方程對數值格式的要求。
  2. In fluid field solving, the numerical flux is estimated using high - accuracy roe scheme with limiter. in time marching, we use dual - time stepping together with implicit lu - sgs scheme and get reasonable results efficiently. the difference of the fluid computation between single grid and overset grids lies in the dispose of the computation boundary

    流場解算時，對流場數值通量的求解採用的是帶限制器的高階精度roe格式，時間推進採用了含雙時間步長的隱式lu - sgs （ lower - uppersymmetricgauss - seidel ）格式，提高了求解的效率。
  3. In this paper, high - order accurate weighted essentially non - oscillatory ( weno ) schemes are investigated and their applications in hyperbolic conservation laws are discussed. based on this, a new weno difference scheme which based on dispersion - relation - preserving relation is developed, and representative test cases with this scheme for computational aeroacoustics ( caa ) problems has been implemented and compared in order to test capability of wave capturing ; in addition, weno schemes generally do not converge at high order in the presence of contact discontinuity of euler equations, so a conservative front tracking technique coupling weno schemes and level set method to simulate the translating density profile is presented here, and numerical simulation with this technique for representative test case has been implemented and results show the desired accuracy

    本文研究了高階精度加權基本無振蕩（ weno ）格式及其在雙曲守恆律方程中的應用，在此基礎上作了兩個方面的工作：一是針對高頻聲波問題構造出一種基於保色散關系（ drp ）的weno有限差分格式，並對計算氣動聲學（ caa ）問題的代表性算例進行了大量數值實驗，比較了該格式捕捉波數的能力；另外，針對高階weno格式在處理euler方程的接觸間斷時精度有所降低的問題，研究了利用界面追蹤技術levelset方法和高階激波捕捉weno格式相結合的一種守恆追蹤方法，並且給出有代表性的密度滑移面問題的算例，得到一致高階精度的數值模擬結果。
  4. A normal transform is introduced, and there are enough much grids in the region between the critical layer and the wall, where the variation of the disturbance is the quickest. the finite - difference of governing equations with fourth - order accuracy in the normal direction is utilized in full regions including points close the wall, and is very important for accurately discreting equations. the combination of global and local methods is implemented, and a new iterative formula is derived

    對于曲線坐標系下的拋物化穩定性方程，文中發展了求解的高效數值方法:引進法向變換，使得在臨界層與壁面之間的擾動量變化最快的區域有更多的法向網格點;導出包含邊界鄰域在內的完全四階精度的法向有限差分格式，這對方程精確離散至關重要;採用全局法和局部法相結合的方法及其新的迭代公式，大大加速收斂並得到更精確的特徵值。
  5. In this paper, we develop the high - order accurate essentially non - oscillatory ( eno ) schemes on one and two - dimensional structured meshes in the finite volume formulation, and discuss their applications in hyperbolic conservation laws

    本文構造了一維、二維結構網格中的高階精度基本無振蕩（ eno ）有限體積格式，並且討論了它在雙曲守恆型方程中的應用。
  6. In order to achieve a computer code with a maximum degree of vectorization, the numerical flux function must be written uniformly with sign function. to get higher order accuracy, the muscl interpolation functions are applied for van leer and roe schemes

    Vanleer和roe格式摘要（ abstraet ）均採用muscl插值使格式具有高階精度，並採用連續可微的vanalbada通量限制器，使格式具有良好的穩定性和收斂特性。
  7. The fourth - order compact difference schemes with high resolution are applied to discretize the space derivatives, and a low - storage fourth - order explicit runge - kutta scheme is used in time marching

    文中採用具有高解析度的4階精度的緊致差分格式離散空間導數，同時，時間步進採用低存儲量要求的4階顯式runge - kutta格式。
  8. 3. the modeling method based on mechanism analysis and identification method always exits unmodeled high - order part and the modeling method based on neural networks usually has not good enough generalization capability. we fuse above two kinds of modeling method and put forward a hybrid modeling method based on mechanism analysis, identification and rbf neural networks. this paper proposed a hybr id modeling method based on mechanism analysis, identification and rbf neural networks. first, get a object ' s low - order model by the mechanism analysis and identification method. second, adopt rbf neural networks modeling method to compensate unmodeled high - order model. the sum of the low - order model and high - order model is the hybrid model. this kind of hybrid model has more accuracy than a model based on mechanism analysis and identification and has more generalization capability than a model based on neural networks

    針對基於機理分析和辨識的建模方法總是存在未建模的高階部分，精度不夠高和神經網路建模方法泛化能力差的缺點，將這兩種建模方法進行融合，提出基於機理分析、系統辨識和rbf神經網路的混合建模方法，首先採用機理分析和辨識的方法得到工業對象的低階模型，再用rbf神經網路建模方法補償未建模高階模型，這樣得到的混合模型，比單純基於機理分析和辨識的建模方法具有更高的精度，比單純的神經網路的建模方法具有更好的泛化能力。
  9. Abstract : this paper discusses high order numerical model of non - linear boundary equation. by using integral technique, the boundary condition problem is turned into a form initial condition problem. we construct 4 order numerical formula. the convergence theory is given and proved. the examples show that our method has fast convergence speed and less numerical time

    文摘:討論非線性邊值問題的一種高精度計算模型.利用積分值將邊值問題轉化為形式初值問題，構造了一類四階精度的計算格式，證明了收斂性.通過算例表明該方法收斂速度高，計算量小
  10. The above spatial and temporal discretization in the boundary, and two - directional average in the intersection, can satisfy completely n - s equations, and have high accuracy in the all computational regions

    對邊界上的空間微分採用高階緊致差分格式離散，時間微分採用四階時間推進處理，在交界處採用雙向差分平均法，保證了整個計算域上的流動都滿足navier - stokes方程，並具有高階精度。
  11. We practically applied the wnnd scheme to solve scalar conservation laws and euler system in one dimension and n - s equations in two and three dimensions. the numerical results of wnnd schemes indicated good shock transitions without any noticeable oscillations and uniformly high accuracy in smooth regions. the wnnd scheme could catch the detail o f the flow field more particularly

    本文應用wnnd格式數值模擬求解了一維標量方程、一維歐拉方程、二維n ? s方程和三維n ? s方程，數值結果表明， wnnd格式在激波附近基本無波動，且在解的光滑區保持空間的統一高階精度，較之nnd格式， wnnd格式能夠更高解析度的捕捉到流場細節。
  12. Through extrapolation, the order is poromted from 2 to 4. for rannacher - turek element, its single root also gives lower - bound approximation. however, it can reach fourth order and further extrapolation leads to sixth order, while its repeted root has only second order precision and extrapolation leads to fourth order precision

    實驗結果表明拓廣rannacher - turek元確實給出特徵值的下逼近，並且要優于線性元，外推可以使2階精度提高到4階，而rannacher - turek元對單根同樣給出下逼近，但近似解本身便可達到4階高精度，外推可以獲得更高階（ 6階）精度，重根卻給出上逼近，只具有2階精度，但可以通過外推達到4階精度。
  13. Uniformly high - order accurate eno ( essentially non - oscillatory ) schemes succeed in computing highly accurate numerical solutions to hyperbolic systems of conservation laws, typically second or three order in smooth regions, while maintaining sharp, oscillation free, numerical profiles at discontinuities, but usually their computational cost is quite large

    而一致高階基本無振蕩格式可以成功計算出雙曲型守恆律的高精度數值解，在保持其間斷處陡峭、無振蕩的數值輪廓的同時，並在光滑區域通常達到二階或三階精度，但其計算量卻相當的大。
  14. This thesis presents the high resolution numerical simulation methods for multi - fluid dynamics. the main contents include three parts : the first is a set of interface capturing equations deduced to describe the interface evolution, which is suitable for constructing two - order enhanced un - split finite volume scheme and three - order parabolic - piecewise - method ( ppm ) scheme in euler coordinate ; the second is the capabilities of level - set method for tracking multi - fluid interfaces are unproved ; the third is that the computational resolutions are much more advanced by improving adaptive mesh refinement ( amr ) technique

    主要研究目的是獲得多介質流體流動的高精度數值模擬方法，主要內容包括界面捕捉方程的推導，適用於euler坐標系的增強型二階精度非維數分裂有限體積計算格式和三階精度ppm格式構造，以及發展改進levelset方法提高捕捉流體界面的能力，發展改進網格自適應技術提高各類方程解的計算精度。
  15. Thus the second - order diagnosis equations are introduced. it is necessary to propose the second - order sensitivity with higher accuracy than first - order sensitivity, although the basic thought and sensitivity matrix analysis approach, similar to the first - order sensitivity, are used

    盡管採用了相似於一階靈敏度故障診斷方法的基本思想和靈敏度矩陣分析方法，但是由於二階靈敏度故障診斷方程比一階靈敏度故障診斷方程具有更高的精度，因此引入二階靈敏度是必要的。
  16. Two - order enhanced un - split finite volume euler method for multi - fluid flow, which combines the roe approximate riemann solver, is developed to simulate the multi - fluid interactions, such as the fluid described by polynomial eos, stiffen gas eos, jones - wilkins - lee ( jwl ) gaseous explosive eos, cochran - chan ( cc ) solid explosive eos and hom shock wave eos, etc. numerical results of the id, 2d and 3d multi - fluid interaction examples show that the high - resolution method and interface capturing equations can resolve the multi - fluid flow correctly and successfully. a simple fluid - mixture type ppm algorithm for multi - fluid flow, which is based on vof interface capturing method and resolved by langange / remap two steps, is developed to simulate the high density or high pressure ratio flow at both sides of the interface

    本文提出了實用於多介質流體的增強型二階精度有限體積歐拉數值計算方法，採用roe方法近似求解riemann問題，可以適用於多項式狀態方程、 「 stiffengas 」狀態方程、 jones - wilkins - lee爆轟產物狀態方程、 cochran - chan固體炸藥狀態方程以及hom狀態方程等，並對多介質流體相互作用的一維、二維、三維問題進行數值計算，數值驗證了本文給出的高精度差分格式和界面捕捉方法的正確性，兩種方法耦合形成的多介質流體數值計算方法是成功的。
  17. A two - stage hybrid scheme is proposedbased on the criteria that decreasing mode nuinber reasonably and different attention shouldbe given to different class control variables, i. e., at the begirming stage, a larger granu1arity isused to make ga searching the area contaning optimal sollltion with less generation. thehybrid scheme of binary and integer code distinguished by voltage level is of clear levelconception thus can search the high voltage control variables more carefully. crossover andmutation of ga are also refined on the basis of above scheme

    並從合理減少模式數以及對不同變量給予不同程度關注的原則出發，提出了兩階段分層混合編碼方案：在遺傳演算法的開始階段，用較粗的粒度編碼，使遺傳演算法能夠用較少的迭代次數快速搜索到最優解所在的區域；按電壓等級分層的二進制和十進制混合編碼，具有清晰的層次概念，對那些影響較大的高壓網控制變量能夠有針對性地以更高的精度進行搜索。
  18. Through the research in this thesis, following conclusion can be drew : on the condition of nearly incompressible limit, the n - s equations can be recovered by the lb method ' s models with 2 - order numerical precision ; computational efficiency in simulating flow fields can be improved effectively by perfection of the lb method ' s theory ; development of parallel computation can contribute to the simulation of large - scale flow field with complex geometry

    通過本文的研究，可得出如下結論： lb方法的模型在接近不可壓縮的條件下能夠以二階精度逼近n - s方程； lb方法理論的完善能夠有效地提高流場模擬的計算效率；并行計算的發展有利於lb方法模擬大尺度的復雜流場。
  19. 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。
  20. 5 the post monte carlo method was used to solve the reliability problem with great amount of calculation. this method can satisfy with the precision of reliability analysis, which was feasible in engineering. 6 a feasible way to calculate reliability was obtained, and this method can improve the reliability accuracy

    通過對結構功能函數進行泰勒展開至二次非線形項，並結合工程應用原理，得到一種可行的可靠度實用計算方法，此法無須迭代，從而大大減少計算量，且具有比傳統的一次二階矩法更高的精度。
分享友人
分享到 Line

分享到臉書