Removed unused declared/passed variables

src/compute_convergence_criterion.f90

@@ -49,8 +49,8 @@ logical velocity_converged
 !(((((((((((((((( declaration of the subroutine internal variables )))))))))))))
 !------------------------------------------------------------------------------|
   
-integer err,ierr,iproc,nproc,i
-double precision dduvw,duvw,uvw,time1,time2
+integer ierr,iproc,nproc,i
+double precision dduvw,duvw,uvw
 double precision velocity_diff_norm,maxdiff,oldmax
 character*72 shift