A generalized multiphase modelling approach for multiscale flows

Santis, Andrea De; Colombo, Marco; Hanson, Bruce; Fairweather, Michael

doi:10.1016/j.jcp.2021.110321

Cited by 21 publications

(29 citation statements)

References 42 publications

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“…In this context, the University of Leeds has developed a novel GEneralized Multifluid Modelling Approach (GEMMA) [15]. This approach relies on the multifluid modelling framework for the solution of the governing equations (i.e.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics of annular centrifugal contactors: A CFD analysis using a novel multiphase flow modelling approach

Santis

Hanson

Fairweather

2021

Chemical Engineering Science

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Section: Introductionmentioning

confidence: 99%

Hydrodynamics of annular centrifugal contactors: A CFD analysis using a novel multiphase flow modelling approach

Santis

Hanson

Fairweather

2021

Chemical Engineering Science

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“…This is achieved with a specific methodology to identify large interfaces in the multifluid field from the local length scale of the interface and the local resolution of the computational grid and to set the value of C α accordingly. As mentioned before, in this modelling context, any reference to a "small" or a "large" interface needs to be related to the computational grid used to resolve it (e.g., a small bubble can be treated as a large interface if finely resolved, as performed in [21]). An additional advantage of the GEMMA approach is the capability of choosing which interface scales are resolved.…”

Section: Large Interface Detectionmentioning

confidence: 99%

“…Resolution is acceptable if higher than a critical value, assumed in this work to be equal to 2. The same value has been already used in the validation of GEMMA against several test cases [21], and it is maintained in the present work. If the IRQ condition is met, two conditions can be used to evaluate the local length scale of the interface and effectively activate the large scale formulation of GEMMA.…”

Section: Large Interface Detectionmentioning

confidence: 99%

“…For modelling the surface tension force, the continuum surface force method of Brackbill et al [35] is employed, where the force per unit volume is given by the surface tension, the interface curvature and the gradient of the volume fraction. A density correction is included, given the large density ratio existing between the phases considered [21,36], and the volume fraction field used in the calculation of the curvature is smoothed by successive interpolation from cell centres to faces (smoothed continuum surface force from Ubbink [37]) to limit the appearance of parasitic currents. Finally, the surface tension force is calculated in each cell for each phase k by summation over all the n k phases that share an interface with k in the cell and weighted using the cell phase volume fraction:…”

Section: Interfacial Momentum Transfermentioning

confidence: 99%

“…Most models identify the latter from an a priori function of the local volume fraction, used to distinguish between dispersed and continuous regions, but without accounting for the local morphology of the interface [15,16,20]. In contrast, the recently published generalized multifluid modelling approach (GEMMA) [21] avoids using a priori functions of the volume fraction and directly detects and tracks large interfaces from the local mesh resolution and the morphology of the interface.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Prediction of Horizontal Gas–Liquid Segregated Flow Regimes with an All Flow Regime Multifluid Model

et al. 2022

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The generalized multifluid modelling approach (GEMMA) has been developed to handle the multiplicity of flow regimes and the coexistence of interfaces of largely different scales in multiphase flows. The solver, based on the OpenFOAM reactingEulerFoam family of solvers, adds interface resolving-like capabilities to the multifluid solver in the cells occupied by large interfaces. In this paper, GEMMA is further developed to predict stratified and slug flow regimes in horizontal ducts. The suppression of the turbulence and the wall-like behaviour of large interfaces is modelled with an additional dissipation source. This enables an accurate prediction of the velocity and of the turbulence kinetic energy in a stratified channel flow and the capturing of the formation and the travel of liquid slugs in an annulus. Large interfaces are identified and tracked, not only in the smooth and wavy stratified regimes but also in the much more perturbed interfaces of liquid slugs. The present work confirms GEMMA to be a reliable approach to provide all flow regime modelling capabilities. Further development will be focused on large interface momentum-transfer modelling, responsible for the overestimation of the interfacial shear and the limited liquid excursion during slugs, and the extension to interface break-up and the entrainment of bubbles and droplets, to handle the entire range of regimes encountered in horizontal flows.

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Momentum exchange modeling for coarsely resolved interfaces in a multifield two‐fluid model

Meller

Tekavčič

Krull

et al. 2023

Numerical Methods in Fluids

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Morphology‐adaptive multiphase models are becoming more established for the numerical description of complex gas‐liquid flows adapting dynamically to the local flow morphology. In the present study, two different numerical methods originally designed for distinct flow morphologies are combined, namely the volume‐of‐fluid and the Euler–Euler method. Both edge cases have been proven to be capable of delivering reliable predictions in the respective use cases. The long‐term goal is to improve the prediction of gas‐liquid flows, regardless of the flow regime in a specific application. To capture the system dynamics with a given grid resolution, the flow fields need to be predicted as precise as possible, while the shape of structures such as gas bubbles need to be recovered adequately in topology and shape. The goal is to obtain reliable predictions on intermediate mesh resolutions rather than relying on fine meshes requiring more computational resources. Therefore, a procedure is proposed to locally measure the degree of resolution. With this information, the hydrodynamics in the interface region can be controlled by means of a dedicated interfacial drag formulation in order to improve simulation results across several levels of spatial resolution. A modified formulation of buoyancy is proposed to prevent unphysical oscillations of vertical velocity near a horizontal interface. The functionality is demonstrated in a three‐dimensional case of a gas bubble rising in stagnant liquid and in a co‐current stratified air‐water channel flow in two‐dimensional space. The choice of these different applications demonstrates the general applicability of the proposed model framework.

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A generalized multiphase modelling approach for multiscale flows

Cited by 21 publications

References 42 publications

Hydrodynamics of annular centrifugal contactors: A CFD analysis using a novel multiphase flow modelling approach

Hydrodynamics of annular centrifugal contactors: A CFD analysis using a novel multiphase flow modelling approach

Prediction of Horizontal Gas–Liquid Segregated Flow Regimes with an All Flow Regime Multifluid Model

Momentum exchange modeling for coarsely resolved interfaces in a multifield two‐fluid model

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