HCELL_FLOW_DISPLAY
Plots of HCELL Flow Data

HCELL_FLOW_DISPLAY is a MATLAB library which reads and plots datafiles created by the HCELL fluid flow program.

Usage:

hcell_boundary_display

plots the outline of the region.

hcell_contour_display ( 'node_xy_file_name', 'p_file_name' )

displays a contour plot of the pressure, or other scalars.

hcell_element_display ( 'node_xy_file_name', 'node_element_file_name' )

plots the elements.

hcell_node_display ( 'node_xy_file_name' )

plots the region, and nodes, for either the nodes3.txt or nodes6.txt files created by HCELL.

hcell_vector_display ( 'node_xy_file_name', 'uv_file_name' )

vector plot of the velocity or velocity direction field.

hcell_stream_display ( 'node_xy_file_name', 'uv_file_name' )

streamline plot of the velocity field.

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Related Data and Programs:

CAVITY_FLOW_DISPLAY, a MATLAB program which can plot the data produced by the CAVITY fluid flow program.

DIRECTION_ARROWS, a MATLAB program which plots the velocity direction field.

DIRECTION_ARROWS_SEQUENCE, a MATLAB program which plots the velocity direction fields of many data files with names that are numbered in sequence.

HCELL, a FORTRAN77 program which computes solutions (velocity and pressure) of the time-dependent Navier Stokes equations in a 2D region shaped like an H.

HCELL_STEADY, a FORTRAN77 program which solves the time-independent or "steady" Navier Stokes equations in an H-cell region.

INOUT_FLOW_DISPLAY, a MATLAB program which can plot the data produced by the INOUT fluid flow program.

TCELL_FLOW_DISPLAY, a MATLAB program which can plot the data produced by the TCELL fluid flow program.

VELOCITY_ARROWS, a MATLAB program which plots a velocity vector field.

VELOCITY_ARROWS_GRID, a MATLAB program which reads node and velocity data from a file, and using interpolation is able to display a velocity vector field along any uniform grid of points specified by the user.

VELOCITY_ARROWS_SEQUENCE, a MATLAB program which can process a set of many data files with names that are numbered in sequence.

Source Code:

• file_column_count.m, counts the number of columns in the first line of a file;
• file_row_count.m, counts the number of row records in a file;
• hcell_boundary_add.m, adds the boundary of the region to an existing plot;
• hcell_boundary_display.m, displays the boundary of the region;
• hcell_box_add.m, adds to the current plot a (usually invisible) box that reserves space for titles;
• hcell_contour_display.m, displays a contour plot of a scalar quantity such as pressure;
• hcell_element_display.m, creates a plot of the region and elements;
• hcell_node_display.m, creates a plot of the region and nodes;
• hcell_stream_display.m, creates a streamline plot of a vector quantity such as velocity;
• hcell_vector_display.m, creates a plot of a vector quantity such as velocity or normalized velocity;
• 48mat_data_read.m, reads the data from an R8MAT file;
• r8mat_header_read.m, reads the header from an R8MAT file;
• r8vec_sorted_nearest.m, returns the nearest element in asorted R8VEC;
• r8vec_sorted_unique.m, finds the unique elements in a sorted R8VEC;
• r8vec_sorted_unique_count.m, counts the unique elements in a sorted R8VEC;
• s_len_trim.m, returns the length of a character string to the last nonblank;
• s_word_count.m, counts the number of words in a string;
• timestamp.m, prints the YMDHMS date as a timestamp.

Examples and Tests:

• triangles6.txt, the six nodes that define each (quadratic) element.
• pressure3.txt, the value of the pressure at the linear triangle nodes (this is dummy data right now).
• velocity6.txt, the value of the horizontal and vertical velocity at the quadratic triangle nodes (this is dummy data right now).
• nodes3.txt, the coordinates of the 3 nodes that define the linear triangular elements associated with pressure;
• nodes6.txt, the coordinates of the 6 nodes that define the quadratic triangular elements associated with velocity;
• hcell_boundary_display.png, a PNG image of the boundary of the region.
• hcell_contour_display.png, a PNG image of the pressure contour region. (This plot uses DUMMY data.)

You can go up one level to the MATLAB source codes.