Viscosity and numerical methods
نویسنده
چکیده
In any flow, layers move at different velocities and a fluid’s viscosity arises from the shear stress between the layers that ultimately oppose any applied force. These shear stresses are communicated via collisions between the particles comprising the fluid, and the typical scale of viscosity is therefore of order the mean free collisional length λ. This scale is usually much smaller than the scales that can be represented on a numerical grid, λ << ∆x if one desires to model an astrophysical phenomenon of macroscopic size, and an understanding of this limitation is therefore vital to understanding the limitations of numerical modeling.
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