CFD

CFD tab of model options

This tab allows you set various types of boundary condition for CFD calculations.

If you have previously loaded simulation results as boundary conditions using the CFD Boundary Conditions Edit dialog then this data will be displayed at surface and opening levels.

The attributes that can be set on this tab are shown with the boundary condition type to which they apply. Note that all attributes are displayed at zone level and above in the hierarchy because these act as defaults, but at surface and opening level only the data applicable to the current object is displayed.

Note: Data specified on this tab does not affect EnergyPlus simulations

Inside surface temperature (internal surfaces)

Applies to: Internal surfaces, doors and sub-surfaces

Default inside surface temperature for internal surfaces (partitions, internal floors and ceilings). It can be set for all levels in the model hierarchy from building level down.

Inside surface temperature (external surfaces)

Applies to: External surfaces, doors and sub-surfaces

Default inside surface temperature for external surfaces (walls, roofs, external floors etc). It can be set for all levels in the model hierarchy from building level down.

Inside Surface window temperature

Applies to: Internal and external windows

Default inside surface temperature for window surfaces. It can be set for all levels in the model hierarchy from building level down.

Average zone air temperature

Applies to: Zone

Average zone temperatures are stored at zone level. These aren't used yet in CFD calculations yet but will be used in checks in a future version to ensure equal convective heat gains are considered in the CFD and EnergyPlus simulations.

Incoming air temperature

Applies to: Supply diffusers (types 1-3) and windows, vents, doors and holes

Temperature of air entering the space through windows, vents, doors and holes.

Aperture position

Applies to: Windows

The position of the window aperture in CFD calculations only. This data does not affect EnergyPlus airflow network simulations. Select from:

1-Top - the aperture is in the top of the window. Air flow in and out will flow through the top of the window.
2-Bottom - the aperture is in the bottom of the window. Air flow in and out will flow through the bottom of the window.
3-Left - the aperture is in the left of the window (looking from outside). Air flow in and out will flow through the left of the window.
4-Right - the aperture is in the right of the window (looking from outside). Air flow in and out will flow through the right of the window.

Aperture size

Applies to: Windows

Enter the fractional size of the aperture relative to the overall window size to be used in CFD calculations only. Zero means there is no aperture and 1 means the entire window is open. This data does not affect EnergyPlus airflow network simulations.

Component Blocks, Assemblies and Boundary Condition patchs

Data on this tab is also used for entering boundary conditions for component blocks, assemblies and for boundary condition patches drawn onto zone or component block surfaces. For details see: