Backside features with intermitted pin fins

A combustor for a gas turbine engine, comprising:

• a combustor liner defining a combustion volume;
• and a heat shield panel comprising:
• a panel body having a first surface configured to be oriented toward a combustion zone of the combustor, and a second surface opposite the first surface, the second surface being configured to be oriented toward a combustor liner of the combustor;
• one or more attachment mechanisms configured to connect the panel body to the combustor liner;
• a plurality of standoff pins surrounding each of the one or more attachment mechanisms, each of the plurality of standoff pins including a flat top opposite the second surface;
• a plurality of first pin fins projecting from the second surface of the panel body, wherein each of the plurality of first pin fins has a rounded top opposite the second surface;
• and
• a plurality of second pin fins projecting from the second surface of the panel body, wherein each of the plurality of second pin fins has a flat top opposite the second surface,
• wherein the plurality of second pin fins are intermittently spaced amongst the plurality of first pin fins,
• wherein the plurality of second pin fins are organized in a uniform distribution across the second surface of the heat shield panel;
• wherein at least three of the plurality of second pin fins are organized in a polygon pattern;
• and
• wherein at least one of the plurality of first pin fins is positioned between each of the at least three of the plurality of second pin fins and each other second pin fin of the at least three of the plurality of second pin fins.