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

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

Research output: Contribution to conference without publisher/journalPaper without publisher/journalResearchpeer-review

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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.
Original languageEnglish
Publication date2021
Publication statusPublished - 2021
Event15the RoomVent Virtual Conference - Virtual
Duration: 15 Feb 202117 Feb 2021
Conference number: 15


Conference15the RoomVent Virtual Conference

Bibliographical 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) and, by mistake, with a wrong title in program.


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


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