Compositional Multi-Phase Model Based on Flash Calculations. More...
Classes | |
class | Ewoms::FlashBoundaryRateVector< TypeTag > |
Implements a boundary vector for the fully implicit compositional multi-phase model which is based on flash calculations. More... | |
class | Ewoms::FlashExtensiveQuantities< TypeTag > |
This template class contains the data which is required to calculate all fluxes of components over a face of a finite volume for the compositional multi-phase model based on flash calculations. More... | |
class | Ewoms::FlashIndices< TypeTag, PVOffset > |
Defines the primary variable and equation indices for the compositional multi-phase model based on flash calculations. More... | |
class | Ewoms::FlashIntensiveQuantities< TypeTag > |
Contains the intensive quantities of the flash-based compositional multi-phase model. More... | |
class | Ewoms::FlashLocalResidual< TypeTag > |
Calculates the local residual of the compositional multi-phase model based on flash calculations. More... | |
class | Ewoms::FlashModel< TypeTag > |
A compositional multi-phase model based on flash-calculations. More... | |
class | Ewoms::FlashPrimaryVariables< TypeTag > |
Represents the primary variables used by the compositional flow model based on flash calculations. More... | |
class | Ewoms::FlashRateVector< TypeTag > |
Implements a vector representing rates of conserved quantities. More... | |
Compositional Multi-Phase Model Based on Flash Calculations.
This model assumes a flow of fluid phases
, each of which is assumed to be a mixture
chemical species (denoted by the upper index
).
By default, the standard multi-phase Darcy approach is used to determine the velocity, i.e.
although the actual approach which is used can be specified via the FluxModule
property. For example, the velocity model can by changed to the Forchheimer approach by
The core of the model is the conservation mass of each component by means of the equation
To determine the quanties that occur in the equations above, this model uses flash calculations. A flash solver starts with the total mass or molar mass per volume for each component and, calculates the compositions, saturations and pressures of all phases at a given temperature. For this the flash solver has to use some model assumptions internally. (Often these are the same primary variable switching or NCP assumptions as used by the other fully implicit compositional multi-phase models provided by eWoms.)
Using flash calculations for the flow model has some disadvantages:
It is thus adviced to increase the target tolerance of the Newton scheme or a to use type for scalar values which exhibits higher precision than the standard double
(e.g. quad
) if this model ought to be used.
The model uses the following primary variables: