Adding acoustic example

[germa89]

Close #1428 by adding example to gallery.

Notes

• Before merging this, we should merge Small harmonic analysis improvements #1457 since this branch depends on that one (although I did merge that one into this one to run the CI)
• In the issue script two elements are defined (FLUID30 and FLUID130) but I believe only one is used.
• The mapdl.set("LIST") gives the frequencies duplicated. I believe it is related with complex values, but I'm not sure.

Pinging @akaszynski and @mikerife for feedback.

[codecov]

Codecov Report

Merging #1458 (aff0c2f) into main (2ba15af) will decrease coverage by 0.00%.
The diff coverage is n/a.

❗ Current head aff0c2f differs from pull request most recent head aec29f0. Consider uploading reports for the commit aec29f0 to get more accurate results

@@            Coverage Diff             @@
##             main    #1458      +/-   ##
==========================================
- Coverage   80.32%   80.31%   -0.01%     
==========================================
  Files          43       43              
  Lines        6780     6778       -2     
==========================================
- Hits         5446     5444       -2     
  Misses       1334     1334              

[mikerife]

Hi @germa89 yes the duplicate results are due to complex numbers used in the solution. The SET command has an option to read in the real, imaginary, amplitude, or phase angle.

The model does not use the Fluid130 element. It's a far-field element type so I imagine the intent was to run the analysis with and without it to see its effect. Since the with version was not set up the ET could be deleted.

[akaszynski]

Remind me to review once Mike's suggestions have been incorporated.

[germa89]

@mikerife

I do not think that is the right command.

I guess you mean to use something like SET,LIST, , , 0, with the value 0 for kimg:

I tried that, and still shows both.

>>> mapdl.run("SET,LIST, , , 0")

*****  INDEX OF DATA SETS ON RESULTS FILE  *****

   SET   TIME/FREQ    LOAD STEP   SUBSTEP  CUMULATIVE
     1  220.00             1         1         1
     2  220.00             1         1         1
     3  240.00             1         2         2
     4  240.00             1         2         2
     5  260.00             1         3         3
     6  260.00             1         3         3
     7  280.00             1         4         4
     8  280.00             1         4         4
     9  300.00             1         5         5
    10  300.00             1         5         5
    11  320.00             1         6         6
    12  320.00             1         6         6
    13  340.00             1         7         7
    14  340.00             1         7         7
    15  360.00             1         8         8
    16  360.00             1         8         8
    17  380.00             1         9         9
    18  380.00             1         9         9
    19  400.00             1        10        10
    20  400.00             1        10        10
    21  420.00             1        11        11
    22  420.00             1        11        11
    23  440.00             1        12        12
    24  440.00             1        12        12
    25  460.00             1        13        13
    26  460.00             1        13        13
    27  480.00             1        14        14
    28  480.00             1        14        14
    29  500.00             1        15        15
    30  500.00             1        15        15
    31  520.00             1        16        16
    32  520.00             1        16        16
    33  540.00             1        17        17
    34  540.00             1        17        17
    35  560.00             1        18        18
    36  560.00             1        18        18
    37  580.00             1        19        19
    38  580.00             1        19        19
    39  600.00             1        20        20
    40  600.00             1        20        20
    41  620.00             1        21        21
    42  620.00             1        21        21
    43  640.00             1        22        22
    44  640.00             1        22        22
    45  660.00             1        23        23
    46  660.00             1        23        23
    47  680.00             1        24        24
    48  680.00             1        24        24
    49  700.00             1        25        25
    50  700.00             1        25        25
    51  720.00             1        26        26
    52  720.00             1        26        26
    53  740.00             1        27        27
    54  740.00             1        27        27
    55  760.00             1        28        28
    56  760.00             1        28        28
    57  780.00             1        29        29
    58  780.00             1        29        29
    59  800.00             1        30        30
    60  800.00             1        30        30
    61  820.00             1        31        31
    62  820.00             1        31        31
    63  840.00             1        32        32
    64  840.00             1        32        32
    65  860.00             1        33        33
    66  860.00             1        33        33
    67  880.00             1        34        34
    68  880.00             1        34        34
    69  900.00             1        35        35
    70  900.00             1        35        35
    71  920.00             1        36        36
    72  920.00             1        36        36
    73  940.00             1        37        37
    74  940.00             1        37        37
    75  960.00             1        38        38
    76  960.00             1        38        38
    77  980.00             1        39        39
    78  980.00             1        39        39
    79  1000.0             1        40        40
    80  1000.0             1        40        40

[germa89]

Screenshot:

[akaszynski]

LGTM. Nice work!

[mikerife]

@germa89 the KIMG field of SET does not change the behavior of listing the result sets. But it does change which results are read from the rst file into the mapdl database (memory). The time history processor reads both real and imaginary data; we then have tools to work with that if needed. Like ABS which operates on a complex time history variable and returns the amplitude.
Looks great!