Cylinder Domain - [source code]

Define a cylindrical simulation domain for Eddy3D. One cylindrical mesh serves all wind directions; the cylinder side faces switch between inlet and outlet per direction. The auto radius targets the 3% frontal-blockage limit of ASCE/SEI CWE Prestandard AC 6-8b, which the case component verifies. Model surrounding buildings within ~240 m of the study area (ASCE 49 proximity guidance) before trusting results near the context edge.

Input

Name	Nickname	Description	Type
Core Cell Size	Cell	Cell size of the inner core blocks in meters. Default: 25.	`Number`
Inner Core Size	Inner	Half-size of the square inner core in meters. -1 = auto from the building footprint.	`Number`
Outer Radius	Radius	Outer radius of the cylindrical domain in meters. -1 = auto from the building height.	`Number`
Height		Height of the cylindrical domain in meters. -1 = auto from the building height.	`Number`
Radial Multiplier	RadMult	Cell growth factor from the core toward the perimeter. Default: 2.	`Number`
Core Divisions	Divs	Cells per core block (and per perimeter segment, tangentially). Refines the core without changing the block layout that Core Cell Size sets; the preview core grid densifies to match. Default: 1.	`Integer`
Refinement Box Extension	Refine	Padding of the refinement box around the geometry (m). -1 = auto: 27.5% of the building footprint.	`Number`
Radial Grading	Grade	Far-field cell coarsening across the perimeter ring (outer cell size / inner cell size). 1 = uniform; >1 keeps fine cells at the buildings but grows the outer cells. The default 7 coarsens the far field aggressively (far fewer cells downwind); lower it (1-3) for a gentler, more uniform ring. Default: 7.	`Number`
Core Roundness	Round	Rounds the O-grid inner core from a square (0) toward a circle (1). Higher values even out the radial gap to the outer boundary, cutting the corner non-orthogonality of the square core. 0 keeps the classic square core. 0.65 is the checkMesh-sweep optimum (lowest max non-orthogonality across mesh resolutions; skewness stays well within limits). Default: 0.65.	`Number`
Vertical Grading	GradeZ	Vertical cell expansion ratio (top cell size / bottom cell size). 1 = uniform; >1 keeps fine cells near the ground and coarsens aloft (typical for an ABL). A checkMesh sweep showed non-orthogonality/skewness are unaffected by this; the only cost is background aspect ratio. The default 35 strongly refines the near-ground layer; ease it down if convergence struggles. Default: 35.	`Number`

Output

Name	Nickname	Description	Type
Domain Parameters	Domain	Cylindrical domain parameters (-1 entries mean auto-sized from the building geometry); plug into the wind case Domain input.	`Generic Data`