ENH: objective: added function to output a blank line

to be used in separating instantaneous objective values of different
optimisation cycles.

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

@@ -5,8 +5,8 @@
     \\  /    A nd           | www.openfoam.com
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
-    Copyright (C) 2007-2019 PCOpt/NTUA
-    Copyright (C) 2013-2019 FOSS GP
+    Copyright (C) 2007-2020 PCOpt/NTUA
+    Copyright (C) 2013-2020 FOSS GP
     Copyright (C) 2019 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
@@ -624,6 +624,18 @@ void objective::writeInstantaneousValue() const
 }
 
 
+void objective::writeInstantaneousSeparator() const
+{
+    if (Pstream::master())
+    {
+        if (instantValueFilePtr_.valid())
+        {
+            instantValueFilePtr_() << endl;
+        }
+    }
+}
+
+
 void objective::writeMeanValue() const
 {
     if (Pstream::master())

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

@@ -5,8 +5,8 @@
     \\  /    A nd           | www.openfoam.com
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
-    Copyright (C) 2007-2019 PCOpt/NTUA
-    Copyright (C) 2013-2019 FOSS GP
+    Copyright (C) 2007-2020 PCOpt/NTUA
+    Copyright (C) 2013-2020 FOSS GP
     Copyright (C) 2019 OpenCFD Ltd.
 -------------------------------------------------------------------------------
 License
@@ -355,6 +355,9 @@ public:
         //- Write objective function history at each primal solver iteration
         virtual void writeInstantaneousValue() const;
 
+        //- Write objective function history at each primal solver iteration
+        virtual void writeInstantaneousSeparator() const;
+
         //- Write mean objective function history
         virtual void writeMeanValue() const;