Gausian Invariance
Can anyone explain what is meant by Gauaian Invariance, and how is it noermall applied to N.S equations
Thanks in advance 
Re: Gausian Invariance
Tensors do not change when expressed in a different coordinate system. For example, a vector should still have the same magnitude and direction when expressed in Cartesian coordinates or cylindrical polar coordinates. Not sure of your context, but it is typically applied to models of turbulent transport equations to formulate/check terms and behaviour.

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