Compressible Flow in 3-D Convergent-Divergent Nozzle

$80.00 Student Discount

  • The problem numerically simulates Compressible Flow in a 3-D Convergent-Divergent Nozzle using ANSYS Fluent software.
  • We design the 3-D model by the Design Modeler software.
  • We Mesh the model by ANSYS Meshing software, and the element number equals 898906.
  • We use the Ideal Gas option for air density to define the Compressible flow.
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Description

Compressible Flow in a 3-D Convergent-Divergent Nozzle, ANSYS Fluent CFD Simulation Training

The problem simulates Compressible Flow in a 3-D Convergent-Divergent Nozzle using ANSYS Fluent software. We perform this CFD project and investigate it by CFD analysis.

A de Laval nozzle (convergent-divergent nozzle, CD nozzle, or con-di nozzle) is a tube pinched in the middle, making a carefully balanced, asymmetric hourglass shape.

It is used to accelerate a hot, pressurized gas passing through it to a higher supersonic speed in the axial (thrust) direction by converting the heat energy of the flow into kinetic energy. Because of this, the nozzle is widely used in some types of steam turbines and rocket engine nozzles.

In this project, the airflow will enter the convergent-divergent nozzle with a pressure of 70 bars and a Mach number of 0.2 with a temperature of 2735 K. After passing the throat zone; the airflow will gain speed and lose its temperature as it passes through the diffuser.

The geometry of this model is designed in Design Modeler and meshed in ANSYS Meshing®.

The mesh type used for this geometry is unstructured and has great accuracy in sensitive sections. Also, the element number is 898906

Convergent-Divergent Nozzle Methodology

The Energy Equation is activated due to the compressible flow, and the ideal gas equation is exploited to calculate the density changes in the computational domain.

Convergent-Divergent Nozzle Conclusion

The contours of pressure, temperature, velocity, Mach number, etc., are presented. As it is clear from the contours, the airflow loses its heat after passing through the nozzle opening. It increases its speed as the nozzle opening becomes more extensive than before (in the divergent section), and the volume of passing air increases.

Due to the constant air mass, its density decreases, so according to the continuity law, the velocity increases along with the nozzle. As seen from the Mach contour, the Mach number in the nozzle throat, according to the design mode, is equal to one and then increases in the nozzle’s divergent part.

The Mach number distribution is not uniform in this section due to the nozzle geometry lines’ fracture. However, it has its maximum value at the nozzle output, i.e., where the pressure is precisely at its minimum. There is a border point separation point downstream of the throat. Normal shock also occurred in the throat.

Reviews

  1. Avatar Of Manuel Rutherford Iii

    Manuel Rutherford III

    what a nice mesh, great

  2. Avatar Of Adaline Grimes

    Adaline Grimes

    Hi, great video

  3. Avatar Of Joel Keeling

    Joel Keeling

    Can I get shock wave plot in results??

    • Avatar Of Mr Cfd Support

      MR CFD Support

      Hi, you have to plot the Mach Number or Velocity.

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