The Development of a Benchmark for Room Air Distribution: the backward facing step flow

Peter V. Nielsen, Chen Zhang, Laura Annabella Bugenings, Markus Schaffer

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A CFD workshop on a geometry that can be typical for deep buildings and tunnels took place in 2015 at the ISHVAC-COBEE 2015 conference. The fluid problem investigated in the workshop is known as the backward facing step flow. Members of the workshop made Computational Fluid dynamics (CFD) predictions of the air distribution without having measurements for comparison. Their results show a significant diversity, among other things due to the chosen turbulence models.

A benchmark for the backward-facing step flow is introduced to validate the numerical predictions as well as to assess the influence of different turbulence models, wall functions and other important elements of the software.
Titel15th ROOMVENT Virtual Conference, 2021 : Energy efficient ventilation for healthy future buildings
StatusUdgivet - 2021
Begivenhed15the RoomVent Virtual Conference - Virtual
Varighed: 15 feb. 202117 feb. 2021
Konferencens nummer: 15


Konference15the RoomVent Virtual Conference

Bibliografisk note

RoomVent 2020, the 15th RoomVent Conference, took place on-line from February 15, 2021. The paper were presented in session, Numerical Ventilation Models (NV1)


  • CFD
  • Room air distribution
  • Benchmark
  • Laminar flow
  • Transitional flows
  • Turbulent flow


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