call Gravity_unitTest(integer(IN) :: myPE, integer(IN) :: fileUnit, logical(OUT) :: perfect
This function is the unit test for the Gravity unit. It is invoked in the setup unitTest/Gravity. The Config file for Gravity unit test setup requests an extra variable in the main grid data structure for storing the analytical solution
myPE : local processor number fileUnit : unit number for file opened by the unitTest/Gravity setup in which to write results of the test perfect : indicates test ran without error is true.
eintSwitch a rarely used switch which ensures that internal energy calculations maintain sufficient precision. Important only if energyTotal is dominated by energyKinetic.