Snapshots of computed temperature fields on a cutting plane normal to the cylinder axis midway between piston and head, at three instants in time: top row at −8 °aTDC; middle row at +8 °aTDC; bottom row at +16 °aTDC. At each instant, three temperature fields are shown: the 19-cycle ensemble-averaged mean (left-hand column), a fast cycle (Cycle 1, middle column), and a slow cycle (Cycle 9, right-hand column).