求翻译：式中g为平均速度梯度引起的湍流动能产生项;a为湍流动能；b为耗散率；u为液体的运动粘度，c=0.09[13]。d和f分别是与湍流动能和耗散率对应的Prandtl数。是什么意思？

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In the formula for average velocity gradient G caused turbulence kinetic energy as a result of the turbulence kinetic energy dissipation rate; U; B for the movement to a liquid viscosity, C = 0.09 [ 13 ]. D and F are respectively with turbulence kinetic and dissipation rate Prandtl corresponding to

In the formula g is the turbulent kinetic energy which the average velocity gradient causes produces the item; a is the turbulent kinetic energy; b is a dissipation rating; u is the liquid kinematic viscosity, c=0.09[13).d and f respectively are and the turbulent kinetic energy and the dissipation r

G as in an average speed gradient caused by the turbulent kinetic energy produced; a is the turbulent kinetic energy; b dissipation rate; u for kinematic viscosity of the liquid, c=0.09[13]. D and f, respectively corresponding to the turbulent kinetic energy dissipation rate of the Prandtl number.

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