Auto write the UBlend field to guarantee restarting the simulation.

- Fix #575

Author: TimoLin

applications/solvers/dfLowMachFoam/createLocalBlend.H

@@ -48,7 +48,7 @@ if (foundLocalBlended)
             mesh.time().timeName(),
             mesh,
             IOobject::MUST_READ,
-            IOobject::NO_WRITE
+            IOobject::AUTO_WRITE
         ),
         mesh
     );