Elliptical Nozzle With Inviscid Flow CFD Simulation

Description

Elliptical Nozzle With Inviscid Flow, ANSYS Fluent CFD Simulation Training

The geometry of the solution consisted of an elliptical nozzle. In this project, the airflow will enter the convergent-divergent nozzle with 9800000 pascal and 3710-kelvin pressure. After passing the throat zone, the airflow will gain speed and lose its temperature as it passes through the diffuser. (Elliptical Nozzle With Inviscid Flow)

Geometry and mesh

The geometry of the fluid domain is designed in the Design Modeler, edited with SpaceClaim, and the computational grid is generated using ANSYS Meshing.

Mesh is created with ANSYS meshing software, and the mesh type is unstructured. The number of cells is 1246820.

CFD Simulation

We consider several assumptions to simulate the present model:

• The pressure-based solver method has been selected.
• The simulation is steady.
• The effect of gravity is ignored.

The following table represents a summary of the defining steps of the problem and its solution:

Models
Energy	On
Viscous	inviscid
Materials
Fluid	Definition method	Fluent Database
	Material name	Air
solid	Definition method	Fluent Database
	Material name	Aluminum
Boundary conditions
inlet	Type	Pressure inlet
	pressure	9800000 pa
	temperature	3710 k
outlet	Type	Pressure outlet
	pressure	101325 pa
	temperature	300 k
Material Properties
air
	Molecular weight	20 kg/kmol
	Specific heat	2494 j/kg-k
Solution Methods
Pressure-velocity coupling		coupled
Spatial discretization	pressure	Second-order
	momentum	second-order upwind
	Energy	second-order upwind
	Density	second-order upwind
	Initialization
Initialization method		Standard
Compute from		inlet

Elliptical Nozzle With Inviscid Flow results

The elliptical nozzle under consideration is carried out at an inlet pressure of 9800000 pa, temperature 3710, outlet pressure of 101325 pa, and temperature of 300 K using an inviscid model. The contours of pressure, temperature, velocity, Mach number, etc., are presented. The airflow loses its heat as clear from the contours after passing through the nozzle opening.

It increases its speed as the nozzle opening becomes more extensive than before the volume of passing air increases. Due to the constant air mass, its density decreases, so the velocity increases along with the nozzle according to the continuity law.

As can be 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.