Week 1: Channel flow simulation using CONVERGE CFD

# Channel flow Simulation using Converge CFD

• We need to simulation in 3 different cases and compare with each other, thats are given as follows.

Case 1 (dx = 2e-4m, dy = 2e-4m, dz = 2e-4m).

Case 2 ( dx = 1.5e-4m, dy = 1.5e-4m, dz = 1.5e-4m).

Case 3 ( dx = 1.0e-4m, dy = 1.0e-4m, dz = 1.0e-4m).

Geometry for Cases created in converge.

Case Setup in converge for geometry

Application Type

• Time Base flow / General type flow.

Material Type

• Air (Gas Simulation).

Simulation Parameters

• Run Parameters

1 Solver:- steady-state Solver.

2 Simulation Mode:- Fully hydrodynamic.

3 Gas flow solver:- Compressible

• Simulation time parameters

1 Start time = 0 cyc & End time = 15000 cyc

2 Initial time step = 1e-9 sec & final time step = 1e-9 sec

3 Maximum time step = 1 sec

4 Maximum convection CFL limit = 0.5

5 Maximum diffusion CFL limit = 2

• Solver parameters

1 Navior-Stokes solver schemes = PISO

2 Navior-Stokes solver tyape = Density based

Boundary Conditions

1 Inlet - INFLOW & Pressure -100001 Pa

2 Outlet - OUTFLOW & Pressure - 100000 Pa

3 Top & Bottom -No slip WALL

4 Front & Back - 2D

Initial Conditions & Events

1 Rigion and Initialization

2 Species (Air, O2 = 23%, N2 = 77%)

Boundaries are assigned to volumetric region.

at Temperature is 300K and Pressure is 100001 Pa

Case 1 gride size (dx = 2e-4m, dy = 2e-4m, dz = 2e-4m).

Mesh:

Total Cell Count: 4030

Mass flow rate at inlet:

Mass Flow rate at outlet:

Velocity Plot at inlet:

Velocity Plot at outlet:

Prssure plot at Inlet:

Pressure plot at outlet:

Velocity Profile at 0.5m from inlet

Pressure drop across length:

Result of first case in Paraview:

Velocity counter result:

Pressure Result in paraview:

Case 2 Gride size( dx = 1.5e-4m, dy = 1.5e-4m, dz = 1.5e-4m).

Mesh:

Cell Count: 4884

Mass Flow rate at Inlet:

Mass Flow rate at outlet:

Velocity Plot at Inlet:

Velocity Plot at Outlet:

Pressure Plot at inlet:

Pressure Plot at Outlet:

Result:

Courant Velocity Profile:

Pressure Courant profile:

Velocity Profile at 0.05m

Pressure Drop Profile

Case 3 Grid size ( dx = 1.0e-4m, dy = 1.0e-4m, dz = 1.0e-4m).

Mesh:

Total Cell Count: 6500

Mass Flow rate at Inlet:

Mass Flow rate at Outlet:

Velocity at Inlet:

Velocity at Outlet:

Pressure at inlet:

Prssure at Outlet:

Result:

Counter Velocity Profile:

Counter Pressure:

Velocity profile at 0.05m

Preesure drop profile:

Animation:

Conclusion:

1. The Simulation of flow in three different cases.
2. The parabolic profile shows in the flow at inlet to extream outlet.
3. As we know the grid is less the velocity profile is smoother.
4. As we know the cell increase in the grid size decrease.
5. The Shear stress are occurs at the boundary condition.