convergence rate
 

I am trying to do a grid convergence study for the cell-centered finite volume scheme on unstructured triangular grids. The best convergence rate I could get was around 1.0 (scalar transport equation was solved for the rotating cone test). Does that make sense? Can someone point me to a relevant publication.

Thank you.

c - F & G flux vectors - loop over cells/elements

do i = 1 , ncells

f(i) = q(i)*u(i) ! F flux vector

g(i) = q(i)*v(i) ! G flux vector

enddo

c - build the r.h.s - loop over edges

do i = 1 , nedges

il = cell on the left

ir = cell on the right

flx = ( ( 0.5*( f(il) + f(ir) ) )*nx(i) + ( 0.5*( g(il) + g(ir) ) )*ny(i) ) * side(i)

rhs(il) = rhs(il) - flx

rhs(ir) = rhs(ir) + flx

enddo