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Spraying into the human lungs, Ansys Fluent Training

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In this project, Spraying into the human lungs  has been simulated and the results of this simulation have been investigated.

This product includes Geometry & Mesh file and a comprehensive Training Movie.
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Description

Spraying Project Description

In this study, spraying in human lungs was investigated using the one-way DPM (Disctere phase material) method using Ansys Fluent software. In this simulation, two types of material are used: air and particles that enter the lungs in a Disctere phase material. Trajectories of particles within the lung were observed using Ansys Fluent software. The air inlet velocity enters the field at 5 m / s with a gravity of -9.81 m / s-2 on the z-axis.

Geometry & Mesh

The 3-D geometry of the present model is carried out using Spaceclim software. The inlet diameters of the Lugs are 50 cm.

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For grid generation, unstructured mesh with 3734238 elements in the Ansys Meshing software was utilized. The curvature Method was used to focus on grid-sensitive areas. The following figure shows the mesh generation for this problem.

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Spraying CFD Simulation

To simulate the present model, we consider several assumptions:

  • The solver is pressure-based.
  • The present simulation is performed as the steady-state.
  • The gravity effect is equivalent to -9.81 m.s-1.

For solving the above problem, RANS Includes discrete phase particles by integrating the force balance on the particles, which is written in a Lagrangian reference frame. This force balance equates the particle inertia with the forces acting on the particle.

Here is a summary of the steps for defining the problem and its solution in the following table:

Models
Turbulence models
K-  viscous model
Realizable K- model
Standard wall Function Wall function
Discrete phase model (DPM)
Injection type: Surface velocity inlet
Diameter Distribution: Uniform
Diameter: 1e-4m
Total flow rate: 0.1/s
Material Properties
air
Inert-particle (impurities)
Amount Fluid properties
1550 Density (kg/m3)
Boundary Condition
name Type Amount (units)
Inlet Velocity inlet 5m/s

DPM= escape

Outlet 1 Pressure outlet 0 pa

DPM= escape

Outlet 2 Pressure outlet 0 pa

DPM= escape

Outlet mass outlet 0.005kg/s

DPM= escape

Wall flow wall stationary wall

No-slip

DPM=reflect

Interior interior
Solution methods
Coupled pressure velocity coupling
Second-order pressure spatial discretization
Second-order upwind momentum
First-order upwind turbulent kinetic energy
First-order upwind      turbulent dissipation rate
Second-order upwind Energy
Initialize standard

Results

Finally, extract the amounts of outlet velocity and pressure. In addition, we see Particle tracking in the lungs.

You can obtain Geometry & Mesh file and a comprehensive Training Movie that presents how to solve the problem and extract all desired results.

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