Reassign velocities at the start of each dynamics block.

Author: lohedges

src/somd2/runner/_repex.py

@@ -749,6 +749,9 @@ def _run_block(
 
             _logger.info(f"Running dynamics for {_lam_sym} = {lam:.5f}")
 
+            # Draw new velocities from the Maxwell-Boltzmann distribution.
+            dynamics.randomise_velocities()
+
             # Run the dynamics.
             dynamics.run(
                 self._config.energy_frequency,