CFD models enable the realistic simulation of complex flow phenomena and with that a cost effective proof of functionality. At the same time, enhanced visualizations of simulation results increase the understanding of the complex processes. Due to the flexible adaptability of numerical models, systems can be easily optimized and improved. This leads to a reduction of construction errors while maximizing the benefit.


  • Dimensioning, verification and optimization of hydraulic structures (e.g. fish passages, rakes, culvert structures, stilling basins, throttle structures, tunnels, bridges)
  • Assessment of driftwood / blockage
  • Calculation of dam breaks
  • Calculation of suspension transport
  • Thermal simulations
  • Assessment of river temperature during drought
  • Assessment of river temperature distributions in periods of drought
  • Assessment of thermal lake and river water use (stratification calculations) for heating and cooling
  • Assessment of upstream/ downstream fish migration

  • Verification and optimization of hydraulic structures (e.g. spillways, bottom outlets)
  • Assessment of impulse-induced wave formations
  • Analysis of air entry through turbulence
  • Verification and optimization of stilling basin, energy dissipation
  • Verification and optimization of upstream/ downstream fish migration

  • Verification and optimization of special structures (e.g. fall structures, vortex fall shafts, shaft structures)
  • Verification and optimization of storage channels, flow basins, catch basins, rain overflow basins, rain retention basins
  • Assessment of ventilation

  • Verification and optimization of sedimentation tanks (sand traps, primary settling tanks, secondary settling tanks, lamella separators, thickener)
  • Verification and optimization of rakes (coarse and fine rake)
  • Verification and optimization of activated sludge tanks (denitrification, nitrification, agitators, aeration)
  • Verification and optimization of digester (gas lance, agitators)
  • Verification and optimization of fourth purification stage (activated carbon reactor, ozone reactor)
  • Verification and optimization of special structures (e.g. rakes, pumping stations)

  • Assessment of flow conditions in reservoirs (e.g. residence times)
  • Verification and optimization of reactors and contact pools (ozone, chlorine, chlorine dioxide, powdered activated carbon, flocculants)
  • Assessment of the interference of chemicals and gases
  • Verification and optimization of sedimentation tanks
  • Hydraulic optimization of all system parts
  • Verification and optimization of water distribution and inlets with open filters

Contact person

Michel Kuhlmann

Michel Kuhlmann

MSc. Env. Science ETH

Head of Division Surface Water/CFD

Tel.: +41 (0) 44 288 81 82

Latest News

Andrej Sternin, Michel Kuhlmann, 17. May 2024

For the expansion of ARA Basel, TK CONSULT AG, together with HOLINGER AG, carried out the hydraulic verification of a distribution structure, developed optimization possibilities, and dimensioned the installations in the distribution structure using numerical modeling.

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Andrej Sternin, 23 November 2023

TK CONSULT AG was invited by the VPE/PLM (virtual product development/ product lifecycle management) association to give a presentation on the topic of verification and validation of simulations.

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Michel Kuhlmann, 22 March 2022

Hydraulic verification of structure dimensioning using 3D CFD multiphase modelling.

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Pirmin Ebner, 16. June 2022

In a joint project with HOLINGER AG and Photrack AG, TK CONSULT AG validated results of 3D-CFD simulations performed for the optimization of a distribution structure.

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Mattias Deller, November 3, 2021

Increase of the intake- and cleaning capacity of a rain basin and checking the functionality during rainy weather condition

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Mattias Deller, August, 10th 2021

TK CONSULT AG, together with BKW Energie AG, will hold a webinar on September 20th, 2021 on the topic of "Optimizing the fish ladder at the Bannwil hydropower plant using 3D-CFD-simulation" in Wasser-Agenda-21's "Plattform Revitalisierung".

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Mattias Deller, June 15, 2021

Hydraulic capacity validation of a vortex dropshaft with a fall height of 68 m using 3D-CFD simulations

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Matthias Deller, April, 9th 2021

TK CONSULT AG will give a presentation on 20th of April 2021 at the online VSA-Symposium on "DIGITIZATION IN CONSTRUCTION, OPERATION AND MAINTANENANCE OF DRAINAGE SYSTEMS" The instrument of 3D CFD simulations in urban drainage systems is presented.

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Mattias Deller, 22. February 2021

Hydraulic testing of the renovation work on a rainwater basin and the construction of a new drop shaft using a 3D-CFD simulation.

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Mattias Deller, 12. November 2020

As part of the renovation of a culvert on the Rötelbach in the canton of Thurgau, measures to increase capacity were checked using a 2-phase (water/air) 3D-CFD simulation

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Mattias Deller, 17 August 2020

Hydraulic evaluation and optimization of a union drop shaft

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Mattias Deller, 20. Mai 2020

Optimization of the residence time of an ozonation reactor taking into account fumigation and tracer concentration

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Ramona Nüssli, February 12, 2020

3D-CFD application to validate the temperature stratification of lake water used for industrial purposes

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Deller Mattias, June 14, 2019

Investigation of the mixing performance in a digestion tank for different gas injection configurations.

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Mattias Deller, 15. April 2019

Sludge mixing optimization in a SBR using different stirrer configurations.

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Steffen Corbe, 18. February 2019

3D-CFD-simulations for the verification and optimization of a vortex dropshaft with two-way inflow.

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Mattias Deller, 12. September 2018

The retention time in a fresh water tank has been modeled, using a thermo - hydraulic approach. It could be shown that the steel walls heated by the sun influence the circulation inside the water tank and that compared to a purely hydraulic simulation different retention times are to be expected.

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Steffen Corbe, 23. February 2017

Cooperation with the VAW, ETH Zurich, on "Aeration and two phase flow characteristics of bottom outlets"

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Steffen Corbe, 07. Februar 2017

HOLINGER SA in Luxembourg invited their customers to a customer event staged at BIODIVERSUM in the "Haff Réimech" nature reserve. Steffen Corbe spoke on 3D CFD simulation in water management (Updated slides in German)

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