FSG3132 Gas Dynamics for Internal Combustion Engines 5.0 credits

Gasdynamik för förbränningsmotorer

The course covers a broad range of topics from basic thermodynamics and fluid dynamics principles to a detailed description on compressible gas dynamics and flow instability phenomena associated with turbocharging and gas exchange processes in Internal Combustion Engines (ICE).

Complex gas exchange systems are characteristic to ICE. In modern ICE, Exhaust Gas Recirculation (EGR) systems are used. Power enhancing technologies like turbocharging will continue to play an important role in the future powertrain systems. Thus, the ICE gas exchange systems are constituted from many components, piping systems with valves and flow regulators, junctions and bends leading to a very complex 3D, intermittent, and unsteady flow. The course content includes discussions on turbulence and turbulent mixing in confined conduits, turbocharger thermodynamics, compressible flows/shocks in exhaust valves and turbomachinery, rotating flows, compressor instabilities, details on experimental and computational methods for assessment of unsteady, pulsating flows in manifolds and turbochargers. For a better understanding of the learned topics, the theoretical part is supported by examples and exercises based on computational modelling/experimental measurements for assessing gas exchange processes and aerodynamics design tools for turbochargers.

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Course information

Content and learning outcomes

Course contents *

  1. Overview on thermodynamics
  2. Turbulence and turbulent flows (an overview)
  3. Overview on compressible flow
  4. Introduction to gas exchange in ICE
  5. Rotating flows (effects on flow stability) and flow in complex conduits
  6. Exhaust Gas Recirculation (EGR) assessment
  7. Introduction to centrifugal compressors
  8. Turbocharger thermodynamics / centrifugal compressor and turbine maps
  9. Compressor Instabilities
  10. Assessment of flow related to ICE gas exchanage processes and turbochargers (experimental and computational)

Intended learning outcomes *

After completing this course the student should be able to: explain basic concepts on thermodynamics, turbulence and compressibility and relate them with gas exchange processes and turbocharging flows; derive & interpret basic compressible flow relations; explain typical flow related instabilities in manifolds and rotational machineries; explain different experimental, computational approaches, and models suitable for assessing ICE gas dynamics; theoretical design of simple experimental or computational setups used for assessing flow instabilities related to ICE.    

Course Disposition

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Literature and preparations

Specific prerequisites *

Admitted to PhD-program in a subject related to fluid mechanics.

Recommended prerequisites

A master degree in a mechanics related area    


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Examination and completion

Grading scale *

P, F

Examination *

  • DEL1 - Participation, 1.0 credits, Grading scale: P, F
  • INL1 - Assignment, 4.0 credits, Grading scale: P, F

Based on recommendation from KTH’s coordinator for disabilities, the examiner will decide how to adapt an examination for students with documented disability.

The examiner may apply another examination format when re-examining individual students.

Other requirements for final grade *

The following items have to be approved in order to obtain a pass on the course:

  • Compulsory and active attendance during at least 80% of the lecture time
  • Successful completion of homework assignment within given time frame

Opportunity to complete the requirements via supplementary examination

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Opportunity to raise an approved grade via renewed examination

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Mihai Mihaescu

Further information

Course web

Further information about the course can be found on the Course web at the link below. Information on the Course web will later be moved to this site.

Course web FSG3132

Offered by


Main field of study *

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Education cycle *

Third cycle

Add-on studies

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Mihai Mihaescu

Ethical approach *

  • All members of a group are responsible for the group's work.
  • In any assessment, every student shall honestly disclose any help received and sources used.
  • In an oral assessment, every student shall be able to present and answer questions about the entire assignment and solution.

Supplementary information

The lecture part of the course is given in a compressed time scale with approximately 20h of lectures during 1-2 weeks.

Postgraduate course

Postgraduate courses at SCI/Mechanics