The modeling method of viscous terms of Navier-Stokes equations using distributed viscous body forces was investigated.Then a fast calculation code for the three-dimensional(3-D)unsteady flow in turbomachine was developed

by solving 3-D unsteady Euler equations with the distributed viscous body force model.The code was used to simulate the unsteady flow in a two-stage compressor under circumferential total pressure inlet distortion

and the results were compared with Reynolds averaged Navier-Stokes(RANS) results.This demonstrates that

in the simulation of the unsteady flow in the multi-stage compressor under inlet distortion

the results obtained by the distributed viscous body force model agree well with the RANS results

with substantially less computational cost.