Håkan Nilsson

Professor at Chalmers, Mechanics and Maritime Sciences, Fluid Dynamics

My main area of research is in the hydro turbine area, where I have 2-3 PhD students that are financed by the Swedish Hydro Power Center (www.svc.nu). We focus on the water flow and cavitation in the pressure conduits, spiral casings, distributor, runner and draft tube, and the cooling air flow in electric generators. We develop and validate numerical methods and models (e.g. rotor-stator methods and turbulence modeling), and distribute tutorials and best-practice guidelines. We are also performing experimental measurements.I am also active in PhD projects and Master projects in other areas, such as:* Fibers in air flow* Simulation of flow in flow meters* Flow and heat transfer in TIG-welding* Flow in the human aorta (experimentally and numerically)* Natural convection at free surfaces with surfactants.* Flow in a centrifugal pump* Flow in the swirl generators in Timisoara and Stuttgart* Flow in blood vessels during whiplash motion* CAD and mesh-generation from CT-scanI supervise a large number of small projects in project courses.All numerical work is done with the OpenSource OpenFOAM tool, and I am active in the OpenFOAM community mainly through the Turbomachinery Working Group and in the Workshop Committee.

Source: chalmers.se

Projects

2016–2018

Drakens väg - Optimering av strömkraftverk i havet

Håkan Nilsson Fluid Dynamics
Swedish Energy Agency

2012–2017

Experimental and numerical investigations of cooling air flow in hydro power electric generators

Håkan Nilsson Fluid Dynamics
Valery Chernoray Fluid Dynamics
Hamed Jamshidi Fluid Dynamics
Elforsk

2013–2014

1D system transients coupled with 3D local flow details

Håkan Nilsson Fluid Dynamics
Olivier Petit Fluid Dynamics
Elforsk

2012–2016

Unsteady incompressible flow in rotating machinery

Håkan Nilsson Fluid Dynamics
Ardalan Javadi Fluid Dynamics
Elforsk

2012–2013

Värmeöverföringsmätningar i skalmodell av elgenerator

Håkan Nilsson Fluid Dynamics
Valery Chernoray Fluid Dynamics
ÅForsk (Ångpanneföreningens Foundation for Research and Development)

There might be more projects where Håkan Nilsson participates, but you have to be logged in as a Chalmers employee to see them.

Publications

2017

1D-3D coupling for hydraulic system transient simulations

Chao Wang, Jiandong Yang, Olivier Petit et al
Computer Physics Communications. Vol. 210, p. 1-9
Journal article
2017

Active flow control of the vortex rope and pressure pulsations in a swirl generator

Håkan Nilsson, Ardalan Javadi
Engineering Applications of Computational Fluid Mechanics. Vol. 11 (1), p. 30-41
Journal article
2017

Detailed numerical investigation of a Kaplan turbine with rotor-stator interaction using turbulence-resolving simulations

Ardalan Javadi, Håkan Nilsson
International Journal of Heat and Fluid Flow. Vol. 63, p. 1-13
Journal article
2016

VENTILATION AIR FLOW FIELD CHARACTERISTICS IN A HYDRO GENERATOR Model

Hamed Jamshidi, Håkan Nilsson, Valery Chernoray
Paper in proceedings
2016

Swirling flow in a conical diffuser generated with rotor-stator interaction

Romeo Susan-Resiga, Håkan Nilsson, Håkan Nilsson et al
Other
2016

A physically based model for thermal plasma arc attachment on a W-ThO2 cathode

Isabelle Choquet, Alireza Javidi-Shirvan, Håkan Nilsson
Paper in proceedings
2016

An evaluation of gas transfer velocity parameterizations during natural convection using DNS

Sam Fredriksson, Håkan Nilsson, Robert Handler et al
Journal of Geophysical Research. Vol. 121 (2), p. 1400-1423
Journal article
2016

Ballistic deflection of fibres in decelerating flow

Srdjan Sasic, Håkan Nilsson, Jelena Andric et al
International Journal of Multiphase Flow. Vol. 85, p. 57-66
Journal article
2016

Transient pressure changes in the vertebral canal during whiplash motion – A hydrodynamic modeling approach

Mats Svensson, Huadong Yao, Håkan Nilsson
Journal of Biomechanics. Vol. 49 (3), p. 416-422
Journal article
2016

Air bubbles are released by thoracic endograft deployment: An in vitro experimental study

Anders Jeppsson, Kamuran Inci, Mårten Falkenberg et al
SAGE Open Medicine. Vol. 4, p. 1-5
Journal article
2016

Numerical simulation of conjugate heat transfer and surface radiative heat transfer using the P 1 thermal radiation model: Parametric study in benchmark cases.

Vincenzo Armenio, Carlo Cintolesi, Håkan Nilsson et al
International Journal of Heat and Mass Transfer. Vol. 107, p. 956-971
Journal article
2016

Displacement Forces in Stent Grafts: Influence of Diameter Variation and Curvature Asymmetry

Håkan Nilsson, Håkan Roos, Mårten Falkenberg et al
European Journal of Vascular and Endovascular Surgery. Vol. 52 (2), p. 150-156
Journal article
2016

Surface shear stress dependence of gas transfer velocity parameterizations using DNS

Lars Arneborg, Håkan Nilsson, Sam Fredriksson et al
Journal of Geophysical Research: Oceans. Vol. 121 (10), p. 7369-7389
Journal article
2016

Effect of cathode model on arc attachment for short high-intensity arc on a refractory cathode

Isabelle Choquet, Håkan Nilsson, Alireza Javidi-Shirvan
Journal of Physics D: Applied Physics. Vol. 49 (48), p. Article No 485201 -
Journal article
2016

Experimental and numerical investigation of the precessing helical vortex in a conical diffuser, with rotor-stator interaction

Håkan Nilsson, Ardalan Javadi, Romeo Susan-Resiga et al
Journal of Logic and Computation. Vol. 138 (8), p. Art. no. 081106-
Journal article
2016

Near-surface physics during convection affecting air-water gas transfer

Håkan Nilsson, Robert Handler, Lars Arneborg et al
IOP Conference Series: Earth and Environmental Science. Vol. 35 (1), p. 012007-
Paper in proceedings
2016

Particle-level simulations of flocculation in a fiber suspension flowing through a diffuser

Stefan B. Lindström, Srdjan Sasic, Håkan Nilsson et al
Thermal Science, p. S1-S11
Journal article
2016

A predictive model for gas tungsten arc heat source

Håkan Nilsson, Isabelle Choquet, Alireza Javidi-Shirvan
Paper in proceedings
2015

CFD-based design and analysis of the ventilation of an electric generator model, validated with experiments

Håkan Nilsson, Valery Chernoray, Hamed Jamshidi
International Journal of Fluid Machinery and Systems. Vol. 8 (2), p. 113-123
Journal article
2015

Active Flow Control of Vortex Rope in a Conical Diffuser

Ardalan Javadi, Håkan Nilsson
Paper in proceedings
2015

Numerical Modelling of Blood Pressure Pulses in Vertebral Canal during Whiplash Motion

Håkan Nilsson, Huadong Yao, Mats Svensson
Conference contribution
2015

A fully synthetic turbulent boundary condition with a homogeneous vortex distribution

Olof Penttinen, Håkan Nilsson
Computer Physics Communications. Vol. 190, p. 23-32
Journal article
2015

LES and DES of Strongly Swirling Turbulent Flow through a Suddenly Expanding Circular Pipe

Ardalan Javadi, Håkan Nilsson
Computers and Fluids. Vol. 107, p. 301-313
Journal article
2015

Numerical and experimental investigations of a hydraulic pipe during a gate closure at a high Reynolds number

Håkan Nilsson, James Yang, Michel Cervantes et al
Paper in proceedings
2015

Large Eddy Simulation and Laser Doppler Velocimetry on a vortex flow meter model

Olof Penttinen, Håkan Nilsson
Proceedings from International Symposium of Fluid Flow Measurements. Vol. 2015
Conference contribution
2015

Steady and unsteady numerical simulations of the flow in the Tokke Francis turbine model, at three operating conditions

Håkan Nilsson, Lucien Stoessel
Journal of Physics: Conference Series (1)
Paper in proceedings
2015

Simulation of Water Level Fluctuations in a Hydraulic System Using a Coupled Liquid-Gas Model

Håkan Nilsson, Chao Wang, Jiandong Yang
Water (Switzerland). Vol. 2015 (7), p. 4446-4476
Journal article
2015

Time-accurate Numerical Simulations of Swirling Flow with Rotor-stator Interaction

Håkan Nilsson, Ardalan Javadi
Flow, Turbulence and Combustion. Vol. 95 (4), p. 755-774
Journal article
2015

DIC for Surface Motion Analysis Applied to Displacement of a Stent Graft for Abdominal Aortic Repair in a Pulsating Flow

Håkan Roos, Valery Chernoray, Mikhail Tokarev et al
PIV15; 11th International Symposium on Particle Image Velocimetry, Santa Barbara, California, USA, September 14-16, 2015, p. 1-12
Conference contribution
2015

Exploration of rotation/curvature correction method in hydropower application

Erik Krane, Ardalan Javadi, Håkan Nilsson
Paper in proceedings
2014

Experimental and numerical investigation of hydro power generator ventilation

Hamed Jamshidi, Valery Chernoray, Håkan Nilsson
IOP Conference Series - Earth and Environmental Science: 27th IAHR Symposium on Hydraulic Machinery and Systems (IAHR). Vol. 22, p. Art. no. 012007-
Paper in proceedings
2014

Evaluation of an improved mixing plane interface for OpenFOAM

Robert Magnan, Håkan Nilsson, Martin Beaudoin et al
Proceedings of 27th symposium of hydraulic machinery and systems, 2014, Montreal, Canada
Paper in proceedings
2014

Rheological properties of dilute suspensions of rigid and flexible fibers

Jelena Andric, Håkan Nilsson, Srdjan Sasic et al
Journal of Non-Newtonian Fluid Mechanics. Vol. 212, p. 36-46
Journal article
2014

Velocity and pressure fluctuations induced by the precessing helical vortex in a conical diffuser

Ardalan Javadi, Sebastian Muntean, Håkan Nilsson et al
27th IAHR Symposium on Hydraulic Machinery and Systems, IAHR 2014; Hotel Omni Mont-RoyalMontreal; Canada; 22 September 2014 through 26 September 2014. Vol. 22, p. Art. no. 032009-
Paper in proceedings
2014

LES and DES of swirling flow with rotor-stator interaction

Håkan Nilsson, Ardalan Javadi
Notes on Numerical Fluid Mechanics and Multidisciplinary Design. Vol. 130, p. 457-468
Paper in proceedings
2014

A comparative study of scale-adaptive and large-eddy simulations of highly swirling turbulent flow through an abrupt expansion

Håkan Nilsson, Ardalan Javadi
27th IAHR Symposium on Hydraulic Machinery and Systems, Montreal, Canada, p. Art. no. 022017-
Paper in proceedings
2014

MODELLING OF ELECTRODE-ARC COUPLING IN ELECTRIC ARC WELDING

Alireza Javidi-Shirvan, Håkan Nilsson, Isabelle Choquet
Paper in proceedings
2014

Flow of cooling air in an electric generator model - An experimental and numerical study

Pirooz Moradnia, Valery Chernoray, Maxim Golubev et al
Applied Energy. Vol. 114, p. 644-653
Journal article
2014

Numerical investigation of fiber flocculation in the air flow of an asymmetric diffuser

Jelena Andric, Håkan Nilsson, Stefan B. Lindström et al
Paper in proceedings
2014

Displacement Forces in Iliac Landing Zones and Stent Graft Interconnections in Endovascular Aortic Repair: An Experimental Study

Mårten Falkenberg, Anders Jeppsson, Håkan Roos et al
European Journal of Vascular and Endovascular Surgery. Vol. 47 (3), p. 262-267
Journal article
2014

Experimental assessment of a fully predictive CFD approach, for flow of cooling air in an electric generator

Håkan Nilsson, Pirooz Moradnia, Valery Chernoray
Applied Energy. Vol. 124, p. 223-230
Journal article
2014

Unsteady numerical simulation of the flow in the U9 Kaplan turbine model

Håkan Nilsson, Ardalan Javadi
27th IAHR Symposium on Hydraulic Machinery and Systems, IAHR 2014; Hotel Omni Mont-RoyalMontreal; Canada; 22 September 2014 through 26 September 2014. Vol. 22, p. Art. no. 022001-
Paper in proceedings
2013

A particle-level rigid fiber model for high-Reynolds number flow, implemented in a general-purpose CFD code

Håkan Nilsson, Srdjan Sasic, Stefan B. Lindström et al
Paper in proceedings
2013

Numerical Investigations of Unsteady Flow in a Centrifugal Pump with a Vaned Diffuser

Olivier Petit, Håkan Nilsson
International Journal of Rotating Machinery. Vol. Volume 2013
Journal article
2013

Description and validation of a flexible fiber model, implemented in a general-purpose CFD code

Stefan B. Lindström, Srdjan Sasic, Håkan Nilsson et al
Paper in proceedings
2013

Magnetic field models for high intensity arcs, applied to welding - A comparison between three different formulations

Alireza Javidi-Shirvan, Isabelle Choquet, Håkan Nilsson
9th International Conference on Trends in Welding Research; Chicago, IL; United States; 4 June 2012 through 8 June 2012, p. 876-885
Paper in proceedings
2013

Advanced numerical prediction of strongly swirling turbulent flows

Håkan Nilsson, Ardalan Javadi
5th International Workshop on Cavitation and Dynamic Problems in Hydraulic Machinery. Vol. 23
Conference contribution
2013

A study of a flexible fiber model and its behavior in DNS of turbulent channel flow

Stefan B. Lindström, Sam Fredriksson, Srdjan Sasic et al
Acta Mechanica. Vol. 224 (10), p. 2359-2374
Journal article
2012

On the choice of electromagnetic model for short high-intensity arcs, applied to welding

Alireza Javidi-Shirvan, Isabelle Choquet, Håkan Nilsson
Journal of Physics D: Applied Physics. Vol. 45 (20)
Journal article
2012

Numerical modelling of shielding gas flow and heat transfer in laser welding process

Isabelle Choquet, Alireza Javidi-Shirvan, Håkan Nilsson
Proceedings of The 5th International Swedish Production Symposium, Linköping, Sweden, p. 269-276
Paper in proceedings
2012

Mathematical, numerical and experimental analysis of the swirling flow at a Kaplan runner outlet

Sebastian Muntean, Håkan Nilsson, Michel Cervantes et al
IOP Conference Series-Earth and Environmental Science: 26th IAHR Symposium on Hydraulic Machinery and Systems. Vol. 15 (Part 3), p. Art. no. 032001-
Paper in proceedings
2012

EXPERIMENTAL AND NUMERICAL STUDY OF COOLING AIR FLOW IN A HYDROELECTRIC GENERATOR

Valery Chernoray, Håkan Nilsson, Pirooz Moradnia
Paper in proceedings
2012

Simulations of the vortex in the Dellenback abrupt expansion, resembling a hydro turbine draft tube operating at part-load

Håkan Nilsson
IOP Conference Series-Earth and Environmental Science: 26th IAHR Symposium on Hydraulic Machinery and Systems. Vol. 15, p. Art. no. 022016-
Paper in proceedings
2012

PIV Measurement of Air Flow in a Hydro Power Generator Model

Maxim Golubev, Pirooz Moradnia, Håkan Nilsson et al
Conference contribution
2012

Effects of inlet boundary conditions, on the computed flow in the Turbine-99 draft tube, using OpenFOAM and CFX

Håkan Nilsson, Michel Cervantes
IOP Conference Series-Earth and Environmental Science: 26th IAHR Symposium on Hydraulic Machinery and Systems. Vol. 15 (PART 3), p. Art. no. 032002-
Paper in proceedings
2012

Transient and steady-state air flow simulations in generators using OpenFOAM

Pirooz Moradnia, Federico Torriano, Kristopher Toussiant et al
Report
2012

A PIV Study of The Cooling Air Flow in An Electric Generator Model

Maxim Golubev, Pirooz Moradnia, Erwin Adi Hartono et al
Report
2011

A PARAMETRIC STUDY OF THE AIR FLOW IN AN ELECTRIC GENERATOR THROUGH STEPWISE GEOMETRY MODIFICATIONS

Pirooz Moradnia, Håkan Nilsson
An ECCOMAS Thematic Conference, CFD and OPTIMIZATION (040)
Paper in proceedings
2011

Numerical simulation of Ar-x%CO2 shielding gas and its effect on an electric welding arc

Alireza Javidi-Shirvan, Nils Stenbacka, Isabelle Choquet et al
Conference contribution
2011

Electric welding arc modeling with the solver OpenFOAM - A comparison of different electromagnetic models

Håkan Nilsson, Alireza Javidi-Shirvan, Isabelle Choquet
Paper in proceedings
2011

IMPLEMENTATION OF A 3D SOLVER FOR ELECTRIC ARC WELDING, COUPLING FLUID MECHANICS WITH ELECTROMAGNETICS

Håkan Nilsson, Margarita Sass-Tisovskaya, Isabelle Choquet
Paper in proceedings
2011

EXPERIMENTAL AND NUMERICAL INVESTIGATION OF THE COOLING AIR FLOW IN AN ELECTRIC GENERATOR

Håkan Nilsson, Valery Chernoray, Pirooz Moradnia
HEFAT2011, 8th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, p. 242-249
Paper in proceedings
2011

Modeling and simulation of a heat source in electric arc welding

Isabelle Choquet, Margarita Sass-Tisovskaya, Håkan Nilsson
Proceedings from the 4th Swedish Production Symposium, Lund, Sweden, p. 202-211
Paper in proceedings
2011

Unsteady Simulations of the Flow in a Swirl Generator, using OpenFOAM

Romeo Susan-Resiga, Sebastian Muntean, Håkan Nilsson et al
International Journal of Fluid Machinery and Systems. Vol. 4 (1), p. pp.199-208
Journal article
2011

Procedure for the break-up of cavitation sheet

Johan Revstedt, Håkan Nilsson, Aurelia Vallier
4-th International Meeting on Cavitation and Dynamic Problems in Hydraulic Machinery and Systems, October, 26-28, 2011, Belgrade, Serbia, p. 77-85
Conference contribution
2010

Simulation of Venous Plexus Blood Flow during Rapid Spinal Bending

Håkan Nilsson, Lars Davidson, Mats Svensson
Paper in proceedings
2010

CFD of Air Flow in Hydro Power Generators for Convective Cooling, using OpenFOAM

Pirooz Moradnia, Håkan Nilsson
5th European Conference on Computational Fluid Dynamics, ECCOMAS CFD 2010, p. 556-
Paper in proceedings
2010

Mass transfer cavitation model with variable density of nuclei

Aurelia Vallier, Håkan Nilsson, Johan Revstedt
Paper in proceedings
2010

Comparison of numerical and experimental results of the flow in the U9 Kaplan turbine model

Olivier Petit, Håkan Nilsson, Berhanu Mulu et al
Paper in proceedings
2010

A swirl generator case study for OpenFOAM

Olivier Petit, Sebastian Muntean, Romeo F. Susan-Resiga et al
Paper in proceedings
2009

The ERCOFTAC centrifugal pump OpenFOAM case-study

Maryse Page, Håkan Nilsson, Olivier Petit et al
IAHR International Meeting of the Workgroup on Cavitation and Dynamic Problems in Hydraulic Machinery and Systems, p. 523-532
Paper in proceedings
2009

Numerical Estimation of Torsional Dynamic Coefficients of a Hydraulic Turbine

Jan-Olov Aidanpää, Håkan Nilsson, Martin Karlsson
International Journal of Rotating Machinery. Vol. 2009
Journal article
2009

3D numerical analysis of the unsteady turbulent swirling flow in a conical diffuser using Fluent and OpenFOAM

Håkan Nilsson, Sebastian Muntean, Romeo Susan-Resiga
Proceedings of the 3rd IAHR International Meeting of the Workgroup on Cavitation and Dynamic Problems in Hydraulic Machinery and Systems. Vol. 1, p. 155-164
Paper in proceedings
2008

The flow in the U9 Kaplan turbine - preliminary and planned simulations using CFX and OpenFOAM

Thi VU, Olivier Petit, Svante LEONSSON et al
Paper in proceedings
2008

Design and Validation of a Scale-Adaptive Filtering Technique for LRN Turbulence Modeling of Unsteady Flow

Walter Gyllenram, Håkan Nilsson
Journal of Fluid Engineering. Vol. Volume 130 (Issue 5), p. 10-
Journal article
2007

On the failure of the quasicylindrical approximation and the connection to vortex breakdown in turbulent swirling flow

Walter Gyllenram, Håkan Nilsson, Lars Davidson
Physics of Fluids. Vol. 19 (4)
Journal article
2007

Computations of unsteady cavitating flow on wing profiles using a volume fraction method and mass transfer models

Tobias Huuva, Håkan Nilsson, Göran Bark et al
Proceedings of the 2nd IAHR International Meeting of the Workgroup on Cavitation and Dynamical Problems in Hydraulic Machinery and Systems, Scientific Bulletin of the "Polytechnica" University of Timisoara, Romania. Transactions on Mechanics. Vol. 52 (66), p. 21-34
Conference contribution
2007

Experiences with OpenFOAM for water turbine applications

Håkan Nilsson
Paper in proceedings
2007

Some experiences on the accuracy and parallel efficiency of OpenFOAM for CFD in water turbines

Håkan Nilsson
Lecture Notes in Computer Science. Vol. 4699/2007, p. 168-176
Conference contribution
2006

An Adaptive Turbulence Model for Swirling Flow

Ivana Buntic-Ogor, Eugene Ohlberg, Albert Ruprecht et al
Paper in proceedings
2006

Very Large Eddy Simulations of Draft Tube Flow

Håkan Nilsson, Walter Gyllenram
Paper in proceedings
2006

Large Eddy Simulation of Turbulent Swirling Flow Through a Sudden Expansion

Lars Davidson, Walter Gyllenram, Håkan Nilsson
Paper in proceedings
2005

OpenFOAM SIMULATION OF THE FLOW IN THE HöLLEFORSEN DRAFT TUBE MODEL

Håkan Nilsson, Maryse Page
Paper in proceedings
2004

Numerical Investigations of Swirling flow in a Conical Diffuser

Walter Gyllenram, Håkan Nilsson
22nd IAHR Symposium, Stockholm, Sweden, June 29 - July 2, 2004. Vol. A, p. A09-2 (1-10)-
Paper in proceedings
2003

Temporally fluctuating prey and coexistence among unequal conspecific interferers

Graeme D. Ruxton, P. Anders Nilsson, Håkan Nilsson
Oikos. Vol. 101, p. 411-415
Journal article
2003

Application of an Angular Momentum Balance Method for Investigating Numerical Accuracy in Swirling Flow

Lars Davidson, Håkan Nilsson
J. Fluids Eng.. Vol. 125 (4), p. 723-730
Journal article
2003

Validations of CFD against detailed velocity and pressure measurements in water turbine runner flow

Lars Davidson, Håkan Nilsson
Int. J. Numer. Meth. Fluids. Vol. 41, p. 863-879
Journal article
2003

Assessment of turbulence modelling for CFD simulations into hydroturbines: spiral casings

Luis C. Eduardo Oliveira de Souza, Marcelo Dias de Moura, Antonio C.P. Brasil Junior et al
Paper in proceedings
2001

Parallel multiblock CFD computations applied to industrial cases

Lars Davidson, Simon Dahlström, Håkan Nilsson
Parallel Computational Fluid Dynamics - Trends and applications, p. 525-532
Paper in proceedings
1999

A numerical investigation of tip clearance flow in Kaplan water turbines

Lars Davidson, Håkan Nilsson
Proceedings of HYDROPOWER INTO THE NEXT CENTURY - III, p. 327-335
Paper in proceedings