Page 324 - TransAT_Tutorial_Manual

TransAT Tutorial Manual 7.3. Oilspill

BCs Tab
• Select the BCs tab

Creating Boundary Conditions:
In this test case, a wall is at Ymin, pressure outflows at Ymax, Xmin and Xmax. Symmetry
boundary conditions are applied at Zmin and Zmax (flow is not solved in z-direction). On top of
this, we will add an inflow boundary conditions between the two spill walls. The outflows at the
top and on the side are differentiated, because a pressure gradient is initialised on the sides but
not at the top.

• From the Inflow BC, click to set the boundary condition properties

• Fill in the inflow properties:

– In the Basic tab
∗ Inflow Data Source: From BC
∗ Inflow Type: Velocity based
∗ Inflow profile: constant
∗ Inflow Velocity components: u: 0.0 v: 6.0 w: 0.0
∗ Inflow Static Temperature: 323K

– In Turbulence (RANS) tab:
∗ Turbulent intensity: 0.1
∗ Mu t/mu: 100.0
– In N-phase algebraic slip model tab:

∗ Inflow volume fraction of phase 1 (hydrates) : 0.0
∗ Inflow volume fraction of phase 2 (water) : 0.0
∗ Inflow volume fraction of phase 3 (heavy oil): 0.7
∗ Inflow volume fraction of phase 4 (gas) : 0.3

Note that the velocities per phase are actually not used since ASM (Algebraic
Slip Model) is not used for this testcase. Only the inflow volume fractions have to
be defined, all phases have the same velocity which corresponds to the one given
in the “Basic” tab of the inflow.

• Click

• Proceed similarly as above to have the following boundary conditions available for use.

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