Why rho coeffs are zero in compressible solvers?
in any comressibe solver like rhoCentralFoam and rhoPimpleFoam i have run
The rho residual coeffs are zero.why it is so? And is it possible to see rho field in results without need for making changes in solver? 
Hello, it is probably because density is being computed explicitly, using past time step values for phi field.

thank you dear piccinini.but how about rhoCentralFoam?why rho,rhoE,rhoUx,etc coefficients are zero?in this solver rho Fields are calculeted from continuity because it is a density based solver.

yes, that's right. continuity equation is being solved, but in an explicit manner.
e.g. Code:
solve 
thanks dear piccinini.but could you explain more about explicit solution of rho?zero coeffs how are composed?and then how can i plot rho field in paraview or other plotters?

thank you piccinini.but whats the difference between a density based and a pressure based solver?both calculate rho from other previous fields?and then why the zeros are showing from start to end?could you tell me what have openfoam providers been intended of this displaying manner?

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