Dual-Inlet Swirl Mixing Manifold Mass Conservation

Manifold Hydrodynamics (CFD)PASS · 0.06%

Law of conservation of mass and flow-merging hydraulic losses in a dual-inlet mixing manifold with internal swirl baffle, verifying mass flow balance between dual inlets and single reducer outlet.

Tolerance:: 5%

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Problem statement

Geometry: Manifold with axial inlet diam 54 mm (X in [-160, -60] mm), tangential side inlet diam 46 mm at Y = +18 mm, main chamber diam 90 mm with internal swirl baffle, and conical reducer outlet diam 64 mm (X = 260 mm).
Material: Water at 20 °C (rho = 998.2 kg/m³, mu = 1.002e-3 Pa·s).
Boundary conditions: Axial inlet U1 = 2.5 m/s, tangential side inlet U2 = 3.5 m/s, outlet gauge pressure 0 Pa, no-slip viscous wall on baffle and manifold boundary surfaces.
Measured quantity: Conservation of mass m_out = m_in,1 + m_in,2 = 7.618 kg/s (deviation < 0.1%) and total hydraulic junction pressure loss Delta_p.

WebCAE Terminal

Paste these commands into the Terminal panel inside WebCAE. They use the same text DSL as the application; run one command per line:

units mm
import path="cfd_twin_inlet_manifold.step" format=step
mesh tet size=9
cfd fluid water
cfd set mode=steady speed=2.5 turbulence=sst iterations=300 tol=1e-4 threads=8 intensity=5 multigrid=1 cfl=8
cfd inlet surface number 14 speed=2.5 intensity=0.05
cfd inlet surface number 2 speed=3.5 intensity=0.05
cfd outlet surface number 13 pressure=0
cfd wall surface number 6 monitor=on
cfd wall surface number 7 monitor=on
cfd wall surface number 8 monitor=on
cfd wall surface number 9 monitor=on
cfd wall surface number 12 monitor=on
cfd wall surface number 1 monitor=off
cfd wall surface number 3 monitor=off
cfd wall surface number 4 monitor=off
cfd wall surface number 5 monitor=off
cfd wall surface number 10 monitor=off
cfd wall surface number 11 monitor=off
solve cfd

Results comparison

Reference value	7.618 kg/s
Our result	7.614 kg/s
Deviation	0.06%
Tolerance	5%
Status	PASS · 0.06%
Element family	Finite-volume CFD
Mesh details	2456 узлов, 9147 тет (Netgen P1 tet mesh, смесительный коллектор с закруткой)

Updated: 2026-10-19 · WebCAE solver