Sentences with phrase «large velocity gradients»

Moreover, we contend that the quality of the simulations using the Mixed - SGS approach are severely degraded by excessive dissipation that occurs when the dissipation of the scalar transport schemes is combined with the dissipation due to models for unresolved turbulence that depend on spuriously large velocity gradients produced by the central difference numerics used for momentum.

Not exact matches

As it is, a Hadley cell that conserves angular momentum develops large wind shears and the flow becomes baroclinically unstable (it can be shown through the so - called thermal wind equation that the vertical gradient of the horizontal wind velocity is proportional to the horizontal temperature gradient).

For example, the root system of forest trees facilitates both storage and extraction of moisture from soil; biogenic aerosols produced by trees control the intensity of water vapor condensation over the forest; the large height of trees determines the vertical temperature gradient under the canopy, keeping soil evaporation under biotic control; tall trees are also essential for surface friction that does not allow extremely high wind velocities to develop.