Analysis Characteristics
- Steady-state
- 3D internal flow
- Turbulent
- Incompressible
Reference
White, F.M., Fluid Mechanics, McGraw-Hill (1986).
Problem Description
A three dimensional quarter section of a circular pipe is analyzed to verify the fluid flow and turbulence modeling in
Autodesk® CFD. The pressure drop
is measured well downstream of the entrance length from 50 meters upstream of the outlet to the outlet:
Geometry and Boundary Conditions
Results
Analytical and numerical calculations of pressure drop are compared. The analytical expression for pressure drop
from White (1986) is:
-
is the Darcy friction factor
-
is the mass flow
-
is the pipe length across which
is measured.
The Darcy friction factor is computed from the Blasius expression:
Substituting
= 50m,
= 2356.2
and
Re = 15000 into the expressions above, the following results are computed:
| Benchmark | 2016: Build 20150209 | % Error | 2017: Build 20160302 | % Error | |
|
|
4.02E5 Pa | 384419.92 Pa | 4.26 | 384581.31 Pa | 4.22 |