stagged grid solution is high of numer viscosity?

HT

Do you have similar experience as follows?

For an unsteady 1D tube flow, two runs are made (Re=0, almost imcompressible, central difference, no artificial viscosity):

1) regular uniform mesh

2) stagged grid (u is defined at i, p is defined at i+1/2)

It seems that it is hard for 2) to give unstaedy soluiton; its soluiton monotonically tends to a steady state. Whereas, in 1) some oscillations are observed

Does this imply stagged grid gives solutions with very high artficial viscosity?

Thanks

TTT