Towards the Validation of a CFD Solver for Non-ideal Compressible Flows

A. J. Head*, S. Iyer, C. De Servi, M. Pini

*Corresponding author for this work

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

4 Citations (Scopus)


Mini ORC power systems with the capability to deliver 3-50 kWe are receiving increased recognition for applications such as heat recovery from automotive engines, or distributed power generation from geothermal reservoirs and solar irradiation. Efficient and reliable expanders are the enabling components of such power systems, and all the related developments are currently at the research stage [1]. In the open literature experimental gas dynamic data is limited concerning the fluids and the flow conditions of interest for ORC expanders [2]. Therefore, CFD tools used for the fluid dynamic design of these components cannot be validated against reliable test cases. To bridge this gap, new experimental facilities are currently being built, such as the ORCHID setup [3]. The availability of proper experimental datasets is not, however, the sole requirement for validating a CFD code. Another precondition, equivalently important, is to define an appropriate validation methodology. This paper introduces the first steps towards the validation of a CFD solver for non-ideal compressible flows. Notably, a numerical procedure based on uncertainty quantification analysis has been conceived to assess the accuracy of the thermophysical sub-model of the code, i.e. the equation of state (EoS). Due to the lack of suitable experimental data, a synthetic dataset is generated and used to investigate the validity of the procedure. The associated validation exercise confirms the applicability of the proposed procedure, but also points out that the adopted validation metrics should be complemented with additional statistical indicators.

Original languageEnglish
Title of host publication4th International Seminar on ORC Power Systems September 13-15th 2017
Subtitle of host publicationMilano, Italy
EditorsV. Dosseno, A. Guardone, M. Astolfi
Number of pages8
Publication statusPublished - 2017
Event4th International Seminar on ORC Power Systems - Politecnico Di Milanobovisa Campus, Milano, Italy
Duration: 13 Sept 201715 Sept 2017
Conference number: 4

Publication series

NameEnergy Procedia


Conference4th International Seminar on ORC Power Systems
Abbreviated titleORC 2017
Internet address


  • Design of Experiments
  • Uncertainty Quantification
  • Validation
  • Verification


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