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zero equation
相关语句
  零方程
     Application of Zero Equation Model in Thermal Environment Simulation of Large-Space Buildings
     零方程模型在大空间建筑热环境模拟中的应用
短句来源
     Application of Zero Equation Turbulence Model for Numerical Simulation of Air Distribution in Train Compartment
     零方程湍流模型在列车车厢内气流数值模拟中的应用
短句来源
     In the differential method, zero equation model is adopted, curvature effects both on turbulent viscosity and on basic equations are considered.
     微分法采用零方程模式,不仅考虑曲率对涡粘性系数的影响,而且还计及曲率对方程的影响,得到有曲率的紊流边界层发展趋势。
短句来源
     The indoor zero equation model and SIMPLE algorithm was used in this simulation.
     数值模拟采用室内零方程模型和SIMPLE算法,为了减少网格节省计算时间对房间进行对称处理只计算一半房间。
短句来源
     For calculating temperature field the(v′~(2))-f model is better than the indoor zero equation model,and the k-ε model is the worst among the three.
     从对温度场的预测看,v2′-f模型预测结果最好,室内零方程模型次之,k-ε模型结果最差.
短句来源
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  “zero equation”译为未确定词的双语例句
     The adsorption(or desorption)amount of phosphate by Huanghe River estuarine suspended particles increase(or decrease)with the increase of phosphate concentration in water. The Zero Equation Phosphate Concentration(EPC 0 value)of Huanghe River estuarine suspended particles is in the range of 0. 4—1. 3μmol/dm 3. The EPC 0 value decreases with temperature and increase with the size of suspended particles.
     黄河口悬浮物对磷酸盐的吸附量 (解吸量 )随磷酸盐浓度的增大而增大 (减小 ) ,零平衡时磷酸盐浓度 (EPC0 )值在 0 .4— 1 .3μmol/dm3之间 ,且随温度的升高和悬浮物粒度的增大而略有减小。
短句来源
     Constant a in the first equation, as well as constant a and b in the zero equation are highly significantly correlated to the available soil postassium and to the potassium fertilizer response of barley, also significantly correlated to the potassium uptake by barley in the NP treatment. It is suggested that constants of kinetic equation may be used to evaluate the supplying power of soil potassium.
     建立了动力学方程的常数与土壤钾素状况和大麦钾肥反应之间的相关关系,一级动力学方程的常数a和零级动力学方程的常数a和b与土壤速效钾和大麦相对产量之间达极显著相关,与无钾处理(NP)大麦吸钾量达显著相关,动力学方程的常数可以用于评价土壤的供钾能力。
短句来源
     The accumulative percentage of release(10 h)from the sustained release tablets in the in vitro release test was above 70%. The drug release pattern was in accord with the zero equation .
     体外释放度实验证明 ,10h累积释放量 >70 % ,其释放行为基本符合零级方程 .
短句来源
     RESULTS:The results repeated in three batches showed that the release behavior of the pellet capsules followed ZERO equation.
     结果 :制得的双氯芬酸钠缓释微丸胶囊的体外释药行为符合零级方程 ,批与批之间的重现性良好 ;
短句来源
     (5)the two scale k ε model. The benchmark flows are two transonic flows over bump geometries with shock wave/boundary layer interaction including separation. The computational results demonstrate that the SST model yields superior performance and the zero equation turbulence model does not provide satisfactory results.
     本文选择了两个激波 /边界层相互作用诱导分离的跨声速问题 (轴对称圆弧突起和二维管道突起 ) ,采用五个有代表性的湍流模式 (BL模式 ,JL k-ε模式 ,k-ω模式 ,SST模式和双尺度模式 ) ,通过将数值计算结果和实验结果进行比较 ,对有关的湍流模式进行了评估和分析
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  相似匹配句对
     equation
     方程(之4)
短句来源
     ON THE EQUATION
     关于方程ф(x)=ф(y)
短句来源
     COEFFICIENT OF L-G EQUATION IN ZERO FIELD
     零磁场中L-G方程中的系数α,β
短句来源
     A Application of Zero Hypersurface Equation
     零超曲面方程的一种应用
短句来源
     From zero Hero
     零号英雄
短句来源
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  zero equation
Baldwin-Lomax model, that is the algebraic model, called the zero equation model was used in the computations.
      
We will call this second version of the zero equation model ZE2.
      
The turbulence models ranged from zero equation to Reynolds stress models with the majority using two equation SST k or variants.
      
As a consequence, it i s more appropriate to use a simple approach such as the zero-equation Prandtl mixing length model.
      
A modified zero equation SGS model is developed, to account for the free surface effects.
      


In the former paper entitled "Finite Difference Method of Laminar Boundary Layer"[1], an effective finite difference method was proposed. In this paper the same method is extended and used to calculate the flat plate turbulent boundary layer.We solve the problem by an implicit finite difference method of a grid point pattern in the shape of a horizontal "T" . In the flow direction one-point, or two-point, or three-point backward difference formula is used respectively according to the distance between the grid...

In the former paper entitled "Finite Difference Method of Laminar Boundary Layer"[1], an effective finite difference method was proposed. In this paper the same method is extended and used to calculate the flat plate turbulent boundary layer.We solve the problem by an implicit finite difference method of a grid point pattern in the shape of a horizontal "T" . In the flow direction one-point, or two-point, or three-point backward difference formula is used respectively according to the distance between the grid point and the leading edge. In the vertical direction one-side, or semi-one_side, or central five-point difference formula is used respectively according to the distance between the grid point and the flat plate wall or the outer edge of boundary layer.The zero-equation model of turbulence is used for the sake of simplicity for engineering application, i.e. the Reynolds shear-stress term may be eliminated by the concept of Prandtl's mixing length theory. The different forms of coordinate transformation and the different values of k2 and r are discussed and chosen. The non-dimensional transformation isThe proposed values of k2 and r arek2 = 0.022With such an improvement the numerical results obtained in this paper agree better with the experiment and more complete than those of Cebeci and Smith(CS).

本文采用在《层流边界层的有限差分计算》一文中所提出的处理方法来进行平板湍流边界层的计算,目的在于运用并改进Cebeci and Smith的计算方法(CS方法)。 在本文中仍然采用隐式差分格式,其网格图形为水平的“T”形。根据离前缘距离的不同,沿流动方向分别取一点、二点或三点的一侧差商。根据离壁面及边界层外边界垂直距离的不同,沿垂直方向分别取一侧、半侧或中心的五点差商。 为了工程应用上的简便,湍流模式采用零方程,即湍流剪应力的补充方程采用Prandtl的混合长度理论。讨论并选取了合适的坐标变换、k_2及γ的数值。从计算结果来看,本文所拟定的解题步骤及所编制的计算机计算程序是可行的,具有较高的精度和稳定性,并且得到了比Cebeci和Smith更符合实验的结果,数据也较完整。

In the present report,a finite difference approach is used for computing turbulent boundary layer flow over an infinite swept wing with adverse pressure gradient.Zero equation turbulent model with anisotrop-ically distributed eddy viscosity is adopted in this work.The model is deduced from Michel-Schneider model and Cebeci-Smith two layers model.Newton method is used to handle the complicated iteration procedure.In the present task,the effects of both mixing lengths(inner and outer layer parameters are...

In the present report,a finite difference approach is used for computing turbulent boundary layer flow over an infinite swept wing with adverse pressure gradient.Zero equation turbulent model with anisotrop-ically distributed eddy viscosity is adopted in this work.The model is deduced from Michel-Schneider model and Cebeci-Smith two layers model.Newton method is used to handle the complicated iteration procedure.In the present task,the effects of both mixing lengths(inner and outer layer parameters are included in Cebeci model)and anisotropic eddy viscosity coefficient are discussed.The numerical results are compared with wind tunnel experiments.

本文应用零方程的湍流模型,考虑到三元湍流边界层中涡团粘性的各向异性分布,分别对Michel-Schneider模型和Cebeci-Smith分层模型,采用有限差分和牛顿迭代方法,对有逆压梯度的无限后掠平板机翼湍流边界层进行了计算。文章着重讨论了混合长度(在Cebeci-Smith模型中包括内层参数和外层参数)和涡团粘性各向异性系数的影响,并与风洞实验测量值进行了比较。

In this paper, the test equipments of an idealized slit model with rational boundary is made by conformal transformation.With regard to curved wall turbulent boundary layers, the differential and integral methods have been used to describe the flow patterns. In the differential method, zero equation model is adopted, curvature effects both on turbulent viscosity and on basic equations are considered. The patterns of the development of curved wall turbulent boundary layer are presented in the paper....

In this paper, the test equipments of an idealized slit model with rational boundary is made by conformal transformation.With regard to curved wall turbulent boundary layers, the differential and integral methods have been used to describe the flow patterns. In the differential method, zero equation model is adopted, curvature effects both on turbulent viscosity and on basic equations are considered. The patterns of the development of curved wall turbulent boundary layer are presented in the paper. In the experiments, by measuring and analysing the fluid veloelty and pressure, some hydraulic characters of idealized slit flow are obtained. The test results are close to the calcalation. Then, based on the preliminary view of the cavitation phenomena of idealized slit flow, the test results of cavitation inception and break down condition are also described in this paper. At break down condition, further lowering of tail water pressure could affect the upper pressure no longer, but the throat pressure decreases with lower tail pressure. Finally, the milky flow fills the whole section with a minimum throat pressure equal to vapor pressure.

本文利用保角变换原理设计了从模型进口直段过渡到工作段之间的收缩段边界形状,并制造了理想缝隙流空化试验装置。理论分析中,对整个流场进行计算,对出现有曲率的紊流边界层问题,运用微分法和积分法求解。微分法采用零方程模式,不仅考虑曲率对涡粘性系数的影响,而且还计及曲率对方程的影响,得到有曲率的紊流边界层发展趋势。并利用当量源法对内流中边界层与势流的相互作用进行迭代求解。试验中,对流速、压力进行的测量和分析,得到理想缝隙流的一些水力特性。计算分析结果与试验值较为相符,而微分法的精度则高于积分法。对理想缝隙流的空化现象进行了初步观察,从空化初生和阻塞方面的有关成果说明,在水流发生阻塞时,喉部压力一般高于饱和蒸汽压。

 
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