Master Thesis - Nozzle Design for Spray Shape Optimization

Scania Group; Södertälje kommun; On-site; SEK 240,000 - 300,000; Full time

Job summary

Scania is seeking a master's thesis student to run two- and three-fluid nozzle flow simulations and post-process results to study spray morphology. The project involves transferring results to a Lagrangian spray model and assessing combustion performance.

Work will be conducted in a Linux environment using AVL Fire 3D CFD with potential for exploring new geometries if time allows; expected start January 2027 for around five months.

Qualifications

• Masters degree in mechanical engineering or similar field.
• Specialisation in modelling and simulation is preferred.
• Interest in nozzle flow and spray morphology.

Responsibilities

• Run simulations on specified geometry and postprocess results.
• Adapt geometries if new ideas arise within time limits.
• Use AVL Fire 3D CFD in a Linux environment and script analysis tools.

Skills

CFD modelling

Post-processing

Numerical methods

Scripting

Education

MSc in Mechanical Engineering

Tools

AVL Fire 3D

Linux

Python

Matlab

Job description

30 hp – Nozzle Design for Spray Shape Optimization

Introduction

Thesis work is an excellent way to get closer to Scania and build relationships for the future. Many of today's employees began their Scania career with their degree project.

Background

The project aim is to investigate and quantify the performance impact of geometric design features in high pressure liquid injectors and their dependence on nozzle boundary conditions.

Objective

The expected outcome is to isolate the qualitative impacts of the injector flow conditions on the combustion performance and the liquid spray morphology. Typical spray properties to be studied include spray target angle, spray cone angle and spray tip penetration.

Job Description

Focus will be on running simulations on a given geometry and the postprocessing of model results. However, if interesting new design ideas evolve, other geometries could be included if time allows.

The simulations are done in two steps. Firstly, a 3-fluid (liquid, fuel vapor and air) nozzle flow simulation is conducted and time resolved flow results from the nozzle orifice are extracted. Secondly, these results are transferred to a Lagrangian spray model for high pressure liquid injection, from which the combustion performance is assessed.

The simulations are done using the AVL Fire 3D CFD software package. We work in a Linux environment with very powerful hardware and a simulation is usually completed in 10 hours. Postprocessing is usually done with scripts (e.g. bash, awk, Perl, Python and Matlab) and a plotting program (e.g. XMGRace or GnuPlot).

Education/program/focus

Master of Science in Mechanical Engineering, Engineering Physics or similar, with specialisation in modelling and simulation.

Number of students: 1 or 2

Start date for the thesis work: Jan 2027 or according to an agreement.

Estimated time required: 5 months

Contact persons and supervisors

Dennis Konstanzer, Expert Engineer, [phone] [e-mail]

Niclas Wiker, System Integration and Performance Manager, [phone] [e-mail]

Application:

Your application must include a CV, personal letter and transcript of grades.

A background check might be conducted for this position. We are conducting interviews continuously and may close the recruitment earlier than the date specified.