Internship | Multiphase simulations on acoustic-flow interaction at cavities

TNO; Rijswijk; On-site; EUR 6,700 - 7,300; Full time

Benefits offered by this job

€615 monthly internship allowance

Travel expense contribution

Jong TNO membership

On-site internship in Rijswijk

Job summary

TNO in the Netherlands seeks a MSc student in Mechanical Engineering or Aerospace Engineering for an internship focused on CFD modelling of corrugated hoses to mitigate singing. You will extend work to field conditions and evaluate acoustics coupling.

You will review literature, extend research to field conditions, and calculate acoustic performance for field cases, with on-site work in Rijswijk and a 3-month duration.

Qualifications

• MSc student in Mechanical Engineering, Aerospace Engineering or related field.
• Strong interest in fluid mechanics and numerical modelling.
• Experience with CFD software (e.g., ANSYS Fluent, OpenFOAM or equivalent) is required.
• You can work independently and collaboratively on research tasks.

Responsibilities

• Review literature on CFD modelling of thin films at large scale and high Reynolds.
• Extend existing research to field conditions (larger diameter, higher Reynolds, lower liquid fraction).
• Calculate acoustic performance of cavity with and without liquid and evaluate a field case.

Skills

Fluids mechanics

Numerical modelling

Independent work

Collaboration

Education

MSc student in Mechanical Engineering

MSc student in Aerospace Engineering

Tools

ANSYS Fluent

OpenFOAM

Job description

About this position

Internally corrugated hoses can generate high amplitude tonal sound (called singing or whistling) due to a coupling between the shear layers formed at each cavity and the acoustic field. Small fractions of liquid will limit the amplitude or even eliminate the singing. Liquid injection can even be used for mitigation purposes. Although the main mechanisms of the mitigation of singing are understood, qualitative predictions are difficult. Therefore in this study, it is attempted whether CFD can be used to determine the required liquid fractions for the suppression of singing. In this internship the aim is two-fold:Extend the work to field conditions (larger diameter, higher Reynolds, lower liquid fraction)Evaluate if the influence on the acoustic performance can be determined by combining the two phase simulations with acoustics source modelingEvaluate field case results. A number of field trials were done. By doing CFD on the actual conditions, the field experience is to be linked to CFD results.The final goal is to come to a simulation procedure in which the effect of liquid on singing can be calculated.This works can be done as a work placement internship of 3 months in which the focus will be on field cases or as graduation project in which the focus is on the methodology development.

What will be your role?

• Review literature on CFD modelling of thin films at large scale and high Reynolds.
• Extend existing research to field conditions (larger diameter, higher Reynolds, lower liquid fraction).
• Calculate acoustic performance of cavity with and without liquid and calculate a field case.

What we expect from you

• MSc student in Mechanical Engineering, Aerospace Engineering or a related discipline.
• Strong interest in fluid mechanics and numerical modelling.
• Experience with CFD software (e.g., ANSYS Fluent, Openfoam or equivalent) is required.
• You can work independently on different aspects of scientific research, including literature review and academic writing.
• You are collaborative and proactive.
• You are available to work on location in Rijswijk.

What you’ll get in return

Internship at TNO means working in an environment where substance and impact are central. You will become part of a knowledge organisation where research and practice come together, and where experts collaborate on solutions to current societal and technological challenges. Your internship is a period in which you can discover what suits you, where your strengths lie and what you would like to learn next. You are part of a professional working environment, gain insight into how things work in practice, and have the opportunity to build experience that goes beyond this internship alone. For many students, an internship is therefore also a first step in discovering whether TNO could be a potential next step after graduation.

In addition, we offer you:

• A professional and innovative internship environment in which you actively contribute to societal and technological challenges, working alongside leading experts in your field.
• Personal and dedicated supervision, with focus on your learning objectives, development and study assignment.
• Room to develop: you gain relevant work experience, develop both your subject‑specific and professional skills, and build a valuable network.
• Use of a laptop and the facilities you need to perform your work effectively.
• A monthly internship allowance of € 615 for a full‑time internship, for MSc, BSc and vocational education (MBO) students.
• Up to eight hours of leave per internship month for a full‑time internship, allowing you to balance your internship with your studies and personal life.
• A contribution towards travel expenses if you are not entitled to a student travel card.
• A free membership to Jong TNO: the network for young colleagues, where you can meet other TNO colleagues and participate in sports activities, professional and personal development activities, and social events such as the annual ski trip.

TNO as an employer

Our people are at the heart of TNO. Their curiosity, expertise and entrepreneurial mindset make it possible to deliver high‑impact research and innovations that contribute to society’s sustainable wellbeing and prosperity. That is why we invest in an inspiring and inclusive working environment where colleagues can excel, have autonomy and continue to grow. Your talent and ambition have every opportunity to flourish at TNO. You work with experts (both within and beyond TNO), have access to advanced technology and the freedom to explore, experiment and innovate. Our strength lies in independence, reliability and collaboration. We find each other in wonder and ingenuity. We are driven to push boundaries. By working with businesses and government, and by connecting different perspectives, we strengthen our innovative capability and create responsible, meaningful results. At TNO, we believe this is our time to help society, government and business move forward faster. Together with driven colleagues, you turn knowledge into concrete innovations or ventures that truly make a difference by combining the power of science and entrepreneurship. And in doing so, you make your mark on our time.

Interns at TNO must have a registered residential address in the Netherlands at the start of the internship. Carrying out internship activities from abroad is not possible. Are you an international student? Please note that you must have a BSN (Dutch citizen service number) before the start of your internship. Applying for a BSN can take several weeks, so make sure to start this process well in advance.

Before the start of the internship, an internship agreement must be signed. For students enrolled at a Dutch university or university of applied sciences, TNO uses the UNL-template, supplemented with several TNO‑specific agreements. For students from foreign educational institutions and MBO (secondary vocational education) programmes, the TNO internship agreement applies. TNO does not sign any other internship agreements.