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gradSchemes grad(p) why should we not limit this?

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Old   October 15, 2015, 15:14
Default gradSchemes grad(p) why should we not limit this?
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for your standard turbulent incompressible RANS simulations i have seen exmples that limit (usually with leastsquares) all the grad schemes variables. But, in the motorBike tutorial of the examples given in foam-extend, Openfoam and stated in some forum posts they seem to suggest that you should not limit anything other than grad(U). I guess my question is why? whats the accuracy consequences of doing this, and can anyone direct me to example cases or papers that say why this is the case?
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