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# CDF Report Using a Phoenics Program (Lab Report Sample)

Instructions:

Engineering lab project on phoenics

source..Content:

Student name

Professor’s name

Unit code

06 November 2015

CDF report using a PHOENICS program

Task 1

Question 1

Question 2

In PHOENICS, a dependent variable is the subject in a conservation equation, while the auxiliary variable constitutes the constant as derived from a case algebraic equation. Examples of dependent PHOENIC variables include pressure, enthalpy, volume fractions, temperature and displacements among others. On the other hand, case examples of auxiliary variables include density, diffusivity, velocity, or gravitational forces among others.

Question 3

A problem geometry constitutes of either scalar or vector quantities. Conceptually speaking, scalar quantities constitute one-dimensionally measurable quantities such as temperature, velocity, absorptivity, compressibility, or weight. On the other hand, a geometric vector consists of multi-dimensional quantities, which often constitute both magnitude and direction of orientation. Examples of vector quantities include vector resolute and displacements.

Question 4

Vector quantities are often computed in reference to cells staggered with respect to particular scalar cells. Primarily, these constitute the V cell, the U cell and the Scalar cell. On the other hand, a scalar and by extension, vector quantities are also referenced by a unique index of the form (IX, IY, IZ). However, it should be noted that scalars are stored at the central points of six-sided cells, with the value of the particular scalar being assumed to be typical for the entire cell. Conversely, vectors are stored at the central points of the six faces created within the IX, IY and IZ cell nomenclature.

Question 5

In PHOENICS, grids constitute cells that are topographically made of Cartesian brick elements, and, hence may include three types of grid. These are: 1) Cartesian grids; 2) cylindrical-polar grids; and, 3) Orthogonal (or) non-orthogonal body fitted grids. Despite the grid type exhibited by the PHOENICS, the grid distribution may be non-uniform for all the coordinates or coordinate directions. However, cylindrical-polar coordinates should have the X (or I), Y (or J) and the Z (or K) orientations. In such instances, the X-coordinates are always angular, and the Y-coordinate radial, while the Z-coordinates are always axial in direction.

Question 6

The basic form of balance equation used in CDF codes assumes that:

Outflow from a cell = inflow to the cell – net source within the cell

Question 7

The generalized form of single-phase conservation equation solved in CDF codes takes the form: , where,

r is the density, Ï… the vector velocity, Î“Ï† diffusion exchange coefficient, and, Ñ•Ï† the source term.

Question 8

Particular examples of the single-phase conservation equation are the momentum equation, the enthalpy and the continuity equations among others.

Question 9

The finite volume form of the equation takes the form: INCLUDEPICTURE "/phoenics/d_polis/d_lecs/general/image659.gif" \* MERGEFORMATINET . By continuity,

INCLUDEPICTURE "/phoenics/d_polis/d_lecs/general/image657.gif" \* MERGEFORMATINET , where vt and v1 are turbulent and laminar viscosities consecutively. In the neighbor link, a’s take the form:

INCLUDEPICTURE "/phoenics/d_polis/d_lecs/general/image661.gif" \* MERGEFORMATINET of the convention diffusion transient.

Question 10

In CFD codes, auxiliary equations are used to close the equation set. With CFD equations being highly non-linear, the auxiliary equation set provides for the thermodynamic properties, as well as defines the transport properties, the source terms and the interphase transport features of the CFD problem in question.

Question 11

Differential equations used in CFD computations must be supplemented through diverse boundary conditions before they can be successfully solved. In practice, these boundary conditions define the fluid or heat flow problem as necessary to convey the required information on the amount of fluid that enters a domain. The CFD boundary conditions used in PHOENICS include several variants such as a fixed value, fixed flux rate as well as linear and non-linear components.

Question 12

In PHOENICS, boundary conditions are often represented as linearized sources to the cells adjacent to various boundaries. Here, the boundary conditions take the form: INCLUDE...

Professor’s name

Unit code

06 November 2015

CDF report using a PHOENICS program

Task 1

Question 1

Question 2

In PHOENICS, a dependent variable is the subject in a conservation equation, while the auxiliary variable constitutes the constant as derived from a case algebraic equation. Examples of dependent PHOENIC variables include pressure, enthalpy, volume fractions, temperature and displacements among others. On the other hand, case examples of auxiliary variables include density, diffusivity, velocity, or gravitational forces among others.

Question 3

A problem geometry constitutes of either scalar or vector quantities. Conceptually speaking, scalar quantities constitute one-dimensionally measurable quantities such as temperature, velocity, absorptivity, compressibility, or weight. On the other hand, a geometric vector consists of multi-dimensional quantities, which often constitute both magnitude and direction of orientation. Examples of vector quantities include vector resolute and displacements.

Question 4

Vector quantities are often computed in reference to cells staggered with respect to particular scalar cells. Primarily, these constitute the V cell, the U cell and the Scalar cell. On the other hand, a scalar and by extension, vector quantities are also referenced by a unique index of the form (IX, IY, IZ). However, it should be noted that scalars are stored at the central points of six-sided cells, with the value of the particular scalar being assumed to be typical for the entire cell. Conversely, vectors are stored at the central points of the six faces created within the IX, IY and IZ cell nomenclature.

Question 5

In PHOENICS, grids constitute cells that are topographically made of Cartesian brick elements, and, hence may include three types of grid. These are: 1) Cartesian grids; 2) cylindrical-polar grids; and, 3) Orthogonal (or) non-orthogonal body fitted grids. Despite the grid type exhibited by the PHOENICS, the grid distribution may be non-uniform for all the coordinates or coordinate directions. However, cylindrical-polar coordinates should have the X (or I), Y (or J) and the Z (or K) orientations. In such instances, the X-coordinates are always angular, and the Y-coordinate radial, while the Z-coordinates are always axial in direction.

Question 6

The basic form of balance equation used in CDF codes assumes that:

Outflow from a cell = inflow to the cell – net source within the cell

Question 7

The generalized form of single-phase conservation equation solved in CDF codes takes the form: , where,

r is the density, Ï… the vector velocity, Î“Ï† diffusion exchange coefficient, and, Ñ•Ï† the source term.

Question 8

Particular examples of the single-phase conservation equation are the momentum equation, the enthalpy and the continuity equations among others.

Question 9

The finite volume form of the equation takes the form: INCLUDEPICTURE "/phoenics/d_polis/d_lecs/general/image659.gif" \* MERGEFORMATINET . By continuity,

INCLUDEPICTURE "/phoenics/d_polis/d_lecs/general/image657.gif" \* MERGEFORMATINET , where vt and v1 are turbulent and laminar viscosities consecutively. In the neighbor link, a’s take the form:

INCLUDEPICTURE "/phoenics/d_polis/d_lecs/general/image661.gif" \* MERGEFORMATINET of the convention diffusion transient.

Question 10

In CFD codes, auxiliary equations are used to close the equation set. With CFD equations being highly non-linear, the auxiliary equation set provides for the thermodynamic properties, as well as defines the transport properties, the source terms and the interphase transport features of the CFD problem in question.

Question 11

Differential equations used in CFD computations must be supplemented through diverse boundary conditions before they can be successfully solved. In practice, these boundary conditions define the fluid or heat flow problem as necessary to convey the required information on the amount of fluid that enters a domain. The CFD boundary conditions used in PHOENICS include several variants such as a fixed value, fixed flux rate as well as linear and non-linear components.

Question 12

In PHOENICS, boundary conditions are often represented as linearized sources to the cells adjacent to various boundaries. Here, the boundary conditions take the form: INCLUDE...

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### Other Topics:

- CDF Report Using a Phoenics ProgramDescription: In PHOENICS, a dependent variable is the subject in a conservation equation, while the auxiliary variable constitutes the constant as derived from a case algebraic equation....5 pages/≈1375 words| No Sources | MLA | Nature | Lab Report |