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Steady-State Case Setup

Guide ): one method is cell volume based (proportional to the inverse of the cell volume) and other method is boundary distance based (proportional to the inverse of the distance to the closest boundary).

Cell volume based works best if the component mesh resolution is fine near walls and increases gradually away from walls and becomes similar in size to or larger than the background mesh. Boundary distance based method works best where overlapping meshes have uniform and nearly identical resolutions and therefore it is most suitable when two walls have small distance in between them. In this example, the store wall is very near to the bay wall and the boundary distance based method allows Fluent to create an overset interface somewhere middle of the gap. It is important to have sufficient cells overlapping each other between the gap region of two walls (at least 4 cells from both walls), so it is better to create inflation layers on walls to resolve this requirement.

6.In this step you will create the overset intersection, also referred to as hole cutting. When the case is initialized, ANSYS Fluent automatically creates the overset intersection. Experts have the option to investigate how the intersection is created by enabling expert options in the TUI:

/define/overset-interfaces/options/expert yes

With expert options enabled, you can create the intersection using the following command:

/define/overset-interfaces/intersect-all

You can increase the overset verbosity to have Fluent print more information to the console for any overset process. Verbosity settings range from 0 to 3 depending on the information required. To increase verbosity, enter:

/define/overset-interfaces/options/verbosity 2

To list all overset interface related information, enter:

/define/overset-interfaces/list

12.6. Steady-State Case Setup

In this section you will set up the case for steady-state flow.

12.6.1. General Settings

Retain the setting of steady-state pressure-based solver.

Physics → Solver

12.6.2. Models

1.Enable the energy equation.

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Physics → Models → Energy

2.Specify the k-omega viscous model.

Physics → Models → Viscous...

a.Select k-omega (2 eqn) in the Model group box.

b.Select SST in the k-omega Model group box.

c.Enable the Viscous Heating and Production Limiter options.

d.Click OK to close and confirm the model settings.

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Steady-State Case Setup

12.6.3. Materials

Specify the properties for air.

•Open the Create/Edit Materials dialog box.

Physics → Materials → Create/Edit

a.Select ideal-gas from the Density drop-down list.

b.Click Change/Create and close the dialog box.

12.6.4. Operating Conditions

Set the operating conditions.

Physics → Operating Conditions...

1.Enter 0 pa for Operating Pressure.

2.Click OK to confirm the operating conditions.

12.6.5. Boundary Conditions

1.Set the boundary conditions for the inlet.

Setup → Boundary Conditions → Inlet → pressure-inlet

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a.Enter 154419.3 pa for Gauge Total Pressure.

b.Enter 101325 pa for Super Sonic/Initial Gauge Pressure.

c.Retain Intensity and Viscosity Ratio as the Specification Method in the Turbulence group box.

d.Retain the default values of 5% and 10 for Turbulent Intensity and Turbulent Viscosity Ratio respectively.

e.Click OK to confirm these settings.

2.Set the boundary conditions for outlet.

Setup → Boundary Conditions → Outlet → pressure-outlet

a.Enter 101325 pa for Gauge Pressure.

b.Retain Intensity and Viscosity Ratio as the Specification Method in the Turbulence group box.

c.Retain the default values of 5% and 10 for Backflow Turbulent Intensity and Backflow Turbulent Viscosity Ratio respectively.

d.Click OK to confirm these settings.

3.Keep the defaults for all of the other boundary conditions.

	Release 2019 R1 - © ANSYS,Inc.All rights reserved.- Contains proprietary and confidential information
418	of ANSYS, Inc. and its subsidiaries and affiliates.