Abstract
With increasing subsea oil and gas activities, the safety is
challenged by accidental gas release. This can be caused by
leakage from gas transport pipelines or blowouts from oil and
gas wells. Risk assessment of such events is associated to the
correct prediction of gas flux and gas distribution through the
ocean surface and the resulting surface flows. A quantitative
multiphase CFD model can satisfy such needs. Bubbles can be
tracked by discrete phase model (DPM), using a parcel-based
Lagrangian approach. Capturing the free surface formed by
surfacing bubble plumes can be handled by a volume of fluid
(VOF) model. This constitutes an Eulerian-Lagrangian model
framework combining the DPM and VOF models. The model is
presented and validated by experiments of a gas release in 7 m
deep test basin. Results from modelling and experiments are
consistent.
challenged by accidental gas release. This can be caused by
leakage from gas transport pipelines or blowouts from oil and
gas wells. Risk assessment of such events is associated to the
correct prediction of gas flux and gas distribution through the
ocean surface and the resulting surface flows. A quantitative
multiphase CFD model can satisfy such needs. Bubbles can be
tracked by discrete phase model (DPM), using a parcel-based
Lagrangian approach. Capturing the free surface formed by
surfacing bubble plumes can be handled by a volume of fluid
(VOF) model. This constitutes an Eulerian-Lagrangian model
framework combining the DPM and VOF models. The model is
presented and validated by experiments of a gas release in 7 m
deep test basin. Results from modelling and experiments are
consistent.
