3.2.4 Face Macros

The macros listed in Table  3.2.20- 3.2.23 can be used to return real face variables in SI units. They are identified by the F_ prefix. Note that these variables are available only in the pressure-based solver. In addition, quantities that are returned are available only if the corresponding physical model is active. For example, species mass fraction is available only if species transport has been enabled in the Species Model dialog box in ANSYS FLUENT. Definitions for these macros can be found in the referenced header files (e.g., mem.h).

Face Centroid ( F_CENTROID)

The macro listed in Table  3.2.20 can be used to obtain the real centroid of a face. F_CENTROID finds the coordinate position of the centroid of the face f and stores the coordinates in the x array. Note that the x array is always one-dimensional, but it can be x[2] or x[3] depending on whether you are using the 2D or 3D solver.

Table 3.2.20: Macro for Face Centroids Defined in metric.h

Macro	Argument Types	Outputs
F_CENTROID(x,f,t)	real x[ND_ND], face_t f, Thread *t	x (face centroid)

The ND_ND macro returns 2 or 3 in 2D and 3D cases, respectively, as defined in Section  3.4.2. Section  2.3.15 contains an example of F_CENTROID usage.

Face Area Vector ( F_AREA)

F_AREA can be used to return the real face area vector (or `face area normal') of a given face f in a face thread t. See Section  2.7.3 for an example UDF that utilizes F_AREA.

Table 3.2.21: Macro for Face Area Vector Defined in metric.h

Macro	Argument Types	Outputs
F_AREA(A,f,t)	A[ND_ND], face_t f, Thread *t	A (area vector)

By convention in ANSYS FLUENT, boundary face area normals always point out of the domain. ANSYS FLUENT determines the direction of the face area normals for interior faces by applying the right hand rule to the nodes on a face, in order of increasing node number. This is shown in Figure  3.2.1.

Figure 3.2.1: ANSYS FLUENT Determination of Face Area Normal Direction: 2D Face

ANSYS FLUENT assigns adjacent cells to an interior face ( c0 and c1) according to the following convention: the cell out of which a face area normal is pointing is designated as cell C0, while the cell in to which a face area normal is pointing is cell c1 (Figure  3.2.1). In other words, face area normals always point from cell c0 to cell c1.

Flow Variable Macros for Boundary Faces

The macros listed in Table  3.2.22 access flow variables at a boundary face.

2pac_bring_it_ft_50_cent_2022

The "2022" label in the title likely refers to the year the remix was produced and uploaded by the fan community, rather than a year of recording or official release from a record label.

The music video accompanying the release on YouTube was created by GalilHD , often featuring high-quality edits of archival footage to give the appearance of a modern collaboration. Official vs. Fan-Made Context 2pac_bring_it_ft_50_cent_2022

The beat for this specific version was produced by LowlifeDolla. The "2022" label in the title likely refers

The track blends archival 2Pac verses with verses from 50 Cent. It is common for these remixes to use 2Pac acapellas—some of which were officially provided to producers like Eminem in the past for albums like Loyal to the Game —and pair them with newer beats and guest verses. Fan-Made Context The beat for this specific version

While 50 Cent did have an officially authorized posthumous collaboration with 2Pac on the song "The Realist Killaz" for the 2003 Tupac: Resurrection soundtrack, "Bring It" is not an official estate-sanctioned single.

The song titled "2pac - Bring It (ft. 50 Cent) | 2022" is a or mashup rather than an official posthumous release. It was created by the producer/remixer GalilHD and released on platforms like YouTube and SoundCloud in October 2022. Production Overview

This track is part of a larger trend of "Old School 90s Mix" and "Golden Era Rap" mashups frequently shared by creators like GalilHD and Thug Theory .

See Section  2.7.3 for an example UDF that utilizes some of these macros.

Flow Variable Macros at Interior and Boundary Faces

The macros listed in Table  3.2.23 access flow variables at interior faces and boundary faces.

Table 3.2.23: Macros for Interior and Boundary Face Flow Variables Defined in mem.h

Macro	Argument Types	Returns
F_P(f,t)	face_t f, Thread *t,	pressure
F_FLUX(f,t)	face_t f, Thread *t	mass flow rate through a face

F_FLUX can be used to return the real scalar mass flow rate through a given face f in a face thread t. The sign of F_FLUX that is computed by the ANSYS FLUENT solver is positive if the flow direction is the same as the face area normal direction (as determined by F_AREA - see Section  3.2.4), and is negative if the flow direction and the face area normal directions are opposite. In other words, the flux is positive if the flow is out of the domain, and is negative if the flow is in to the domain.

Note that the sign of the flux that is computed by the solver is opposite to that which is reported in the ANSYS FLUENT GUI (e.g., the Flux Reports dialog box).