Measurement and RANS modelling of large-scale under-expanded CO[sub 2] releases for CCS applications

Abstract

Abstract. The deployment of a complete carbon-capture and storage chain requires a focus upon the hazards posed by the operation of CO 2 pipelines, and the consequences of accidental release must be considered as an integral part of the design process. Presented are results from the application of a shock-capturing numerical scheme to the solution of the Favre-averaged Navier-Stokes fluid-flow equations, coupled with a compressibility-corrected turbulence model, and a novel equation of state for CO 2 . Comparisons are made with a series of as-yet unreported experimental observations of field-scale, high-pressure CO 2 releases. The effects of corrections to the solenoidal turbulence energy dissipation are tested, with conclusions drawn, and recommendations made for future developments.

Validation of turbulence closures for the RANS modelling of under-expanded fluid releases

“…The numerical approach to the modelling of the under-expanded jets was based upon the solutions of the Reynolds-averaged, density-weighted forms of the transport equations for mass, momentum, and total energy as described in detail in Woolley et al [6]. This equation set was closed by the application of a two-equation turbulence model [7] and also a second-moment Reynolds-stress transport model [8].…”