Week 11- Broadband Noise modelling over Ahmed body

1.Describe Ahmed's body and its importance.

Shape of Ahmed body provides a model to study geometrical effects on the wakes of ground vehicles.This is the kind of baseline geometry for automobile bodies.The flow of air arounf ahmed body captures the essential flow features around an automobile and it describe how to calculate the turbulent flow feild around a simple car-loke feometry using the turbulent flow,k-epsilon interface.

Basic Geometry:

2.Setup the domain and setup assuming body is travelling at 110 kmph

import the geometry file

Mesh:

Inflation Layer Applied:

3. Run the setup till convergence and plot for static pressure and coefficient of drag and lift to check for convergence

Solver Settings:

• Solver : Pressure Based
• Simulation Method : Steady state simulation
• Turbulent Model: K-epsilon
• Inlet velocity(x) = 31 m/s
• Inlet Temperature: 300k
• Outlet: Pressure Type,0 guage sensor
• wall:Wall type with no slip

Results:

Velocity:

Temperature

Plots:

Static Pressure Variation:

Drag coeffecient Variation:

4.Turn on Broadband- modelling and detail the acoustic field study over Ahmed body.

After the results Turn ON acoustics and extract the results

Acoustic Power Level Db:

Source Of noice:

Surface Acoustic power level db:

Zoom: