Simcenter STAR-CCM+ Example and how a supersonic rocket nozzle exhaust works - part 1

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This Example is a 2D generic nozzle showing the shock (diamond) pattern formation at supersonic exhaust conditions.


nozzle.sim (59 MB)

A rocket nozzle is used to expand and accelerate the combustion products of rocket engines to high supersonic speeds. The form are normally based on the de Laval nozzle [1], which is a convergent-divergent nozzle (CD Nozzle). The CD Nozzle decreases (converges) its diameter from the begin till the middle (throat), forcing the subsonic flow to accelerate till Mach 1 on the throat and downstream of the throat, the diameter increases again (diverges), allowing the gases to expand isentropically to a supersonic flow. [2]

The nozzle main shapes are convergent (where the diameter decreases), used mainly in jet engines; divergent (where the diameter increases) used mostly in scramjets, and the convergent-divergent nozzle (CD Nozzle), where the diameter decreases till a point (throat) and afterwards increases again, used in rocket engines.
Fig. 1: Nozzle types [4]

In this first part, this is an Example is a 2D generic nozzle showing the shock (diamond) pattern formation at supersonic exhaust conditions. No reactions are modelled.


A comparison between different nozzle types is made in the second part of this article.

The example sim file attached is a demonstration and not an endorsement of a best practice. It is provided to showcase the use of simulation features in a given application.. 
Open the file in a software version equal to or newer than the one specified in the Version Applicable field.

See also:. 

KB Article ID# KB000035704_EN_US



Associated Components

Automotive Aerodynamics Workflow (VSIM) Battery (BSM) Client for CATIA V5 Client for Creo Client for Inventor Client for NX Cycle Average Workflow Design Manager Electronics Cooling Hull Performance Workflow (EHP) In-Cylinder (STAR-ICE) Intelligent Design Exploration (STAR-Innovate) Job Manager Mixing Vessel Workflow (Admixtus) Simcenter STAR-CCM+ Simcenter STAR-CCM+ Clients Viewer (STAR-View+) Virtual Reality