Fix 2D_shockdroplet example case

[wilfonba]

Description

This case file failed as the resolution was increased because the rectangular patches did not cover the entire stretched domain in the y direction.

Fixes #(issue) [optional]

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

Scope

• This PR comprises a set of related changes with a common goal

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.04%. Comparing base (39e410a) to head (a13e932).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #705   +/-   ##
=======================================
  Coverage   43.04%   43.04%           
=======================================
  Files          61       61           
  Lines       16062    16062           
  Branches     1798     1798           
=======================================
  Hits         6914     6914           
  Misses       8158     8158           
  Partials      990      990           

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[VaLiuqqq]

if it is 14D, then the y_centroid is 7D not 6*D.

[sbryngelson]

if it is 14_D, then the y_centroid is 7_D not 6*D.

@wilfonba

[wilfonba]

if it is 14_D, then the y_centroid is 7_D not 6*D.

@wilfonba

The actual value doesn't matter as long as the patch covers the entire grid in the y direction.