ENH: changes related to when the objective value is written

- Objective now inherits from localIOdictionary and writes the mean
objective value under the uniform folder, each time mesh.write() is
called. This is crucial for getting the correct old merit function value
if the simulation is continued from a previous state and lineSearch is
used.
- Objectives are now computed and written even if the corresponding
adjoint solver is inactive. This, among others, is also essential for
getting the correct old merit function value in case of continuation.
- Writing of the objective function (and its mean, if present) history
has now moved to updatePrimalBasedQuantities, instead of the preLoop
part of the adjoint solvers. This was decided to get the objective
values to files, even if the adjoint solver is inactive. Arguably, an
even better place to write the objective functions would be the postLoop
part of the primal solvers, however this might cause multiple writes of
the objective value for the inner iterations of lineSearch, if one is
used.

src/optimisation/adjointOptimisation/adjoint/objectives/objective/objective.H

@@ -40,6 +40,7 @@ SourceFiles
 #ifndef objective_H
 #define objective_H
 
+#include "localIOdictionary.H"
 #include "autoPtr.H"
 #include "runTimeSelectionTables.H"
 #include "OFstream.H"
@@ -57,6 +58,8 @@ namespace Foam
 \*---------------------------------------------------------------------------*/
 
 class objective
+:
+    public localIOdictionary
 {
 protected:
 
@@ -70,9 +73,13 @@ protected:
         bool computeMeanFields_;
         bool nullified_;
 
-        // Objective function value and weight
+        //- Objective function value and weight
         scalar J_;
-        scalar JMean_;  //average value
+
+        //- Average objective value
+        scalar JMean_;
+
+        //- Objective weight
         scalar weight_;
 
         // Objective integration start and end times (for unsteady flows)
@@ -361,6 +368,9 @@ public:
         //- Write mean objective function history
         virtual void writeMeanValue() const;
 
+        //- Write averaged objective for continuation
+        virtual bool writeData(Ostream& os) const;
+
         // Inline functions for checking whether pointers are set or not
         inline const word& objectiveName() const;
         inline bool hasdJdb() const;