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TransAT Tutorial Manual 7.1. Oilseparation

BCs Tab
To see the surfaces of all or each of the boundaries, choose a boundary in the drop-down list at
the top of the BCs tab. One boundary condition of each type is available to be edited and used
from the start. Additional BCs can be created by clicking on . is used to assign a selected
BC to a highlighted surface.

Creating Boundary Conditions:
In this test case, pumps extract water at the bottom of the domain and oil on the right-hand
side of the domain. These two fluid exits will be defined as Inflows. The inflow velocities will be
defined such that the fluids exit the domain.

Other than the inflows, symmetry boundary conditions will be defined for the Z min and Z
max surfaces. The remaining boundaries which comprises the fluid solid interface will automati-
cally be considered as walls.
To create the Inflow boundary condition, follow the instructions given below

• Select the BCs tab
• Beginning from the Inflow BC available, click to set the properties of the boundary
condition

• Fill in the inflow properties as follows:

– In the Basic tab
∗ Inflow Data Source: From BC
∗ Inflow Type: Velocity based
∗ Inflow profile: Constant
∗ Inflow Velocity Components: u: 0.0 v: 0.0 w: 0.0
Note that we do not need to set mixture velocity since for N-phase ASM we set phase
velocities.
– In Turbulence (RANS)
∗ Turbulent intensity: 0.1
∗ Mu t/mu: 100.0
– In N-phase algebraic slip model

∗ Inflow volume fraction of phase 1: 0.44
∗ Inflow volume fraction of phase 2: 0.39
∗ Inflow volume fraction of phase 3: 0.17
∗ Phase velocities: u=0.25 v= 0.0 w=0.0 for phases 1 to 3.

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