diff --git a/src/OpenFOAM/algorithms/subCycle/subCycle.H b/src/OpenFOAM/algorithms/subCycle/subCycle.H
index f0c8958dd0..692146f8c0 100644
--- a/src/OpenFOAM/algorithms/subCycle/subCycle.H
+++ b/src/OpenFOAM/algorithms/subCycle/subCycle.H
@@ -112,10 +112,10 @@ class subCycle
     // Private Member Functions
 
         //- Disallow default bitwise copy construct
-        subCycle(const subCycle<GeometricField>&);
+        subCycle(const subCycle<GeometricField>&) = delete;
 
         //- Disallow default bitwise assignment
-        void operator=(const subCycle<GeometricField>&);
+        void operator=(const subCycle<GeometricField>&) = delete;
 
 
 public:
@@ -123,10 +123,10 @@ public:
     // Constructors
 
         //- Construct field and number of sub-cycles
-        subCycle(GeometricField& gf, const label nSubCycles)
+        subCycle(GeometricField& gf, const label nCycles)
         :
             subCycleField<GeometricField>(gf),
-            subCycleTime(const_cast<Time&>(gf.time()), nSubCycles)
+            subCycleTime(const_cast<Time&>(gf.time()), nCycles)
         {
             // Update the field time index to correspond to the sub-cycle time
             this->updateTimeIndex();
diff --git a/src/OpenFOAM/db/Time/Time.C b/src/OpenFOAM/db/Time/Time.C
index 208f046737..9918881082 100644
--- a/src/OpenFOAM/db/Time/Time.C
+++ b/src/OpenFOAM/db/Time/Time.C
@@ -44,12 +44,14 @@ const Foam::Enum
 <
     Foam::Time::stopAtControls
 >
-Foam::Time::stopAtControlNames_
+Foam::Time::stopAtControlNames
 {
     { stopAtControls::saEndTime, "endTime" },
     { stopAtControls::saNoWriteNow, "noWriteNow" },
     { stopAtControls::saWriteNow, "writeNow" },
     { stopAtControls::saNextWrite, "nextWrite" },
+    // NOTE: stopAtControls::saUnknown is left untabulated here so that it can
+    // be used as fallback value to flag unknown settings
 };
 
 
@@ -57,7 +59,7 @@ const Foam::Enum
 <
     Foam::Time::writeControls
 >
-Foam::Time::writeControlNames_
+Foam::Time::writeControlNames
 {
     { writeControls::wcTimeStep, "timeStep" },
     { writeControls::wcRunTime, "runTime" },
@@ -433,8 +435,8 @@ Foam::Time::Time
     writeControl_(wcTimeStep),
     writeInterval_(GREAT),
     purgeWrite_(0),
+    subCycling_(0),
     writeOnce_(false),
-    subCycling_(false),
     sigWriteNow_(true, *this),
     sigStopAtWriteNow_(true, *this),
 
@@ -502,8 +504,8 @@ Foam::Time::Time
     writeControl_(wcTimeStep),
     writeInterval_(GREAT),
     purgeWrite_(0),
+    subCycling_(0),
     writeOnce_(false),
-    subCycling_(false),
     sigWriteNow_(true, *this),
     sigStopAtWriteNow_(true, *this),
 
@@ -581,8 +583,8 @@ Foam::Time::Time
     writeControl_(wcTimeStep),
     writeInterval_(GREAT),
     purgeWrite_(0),
+    subCycling_(0),
     writeOnce_(false),
-    subCycling_(false),
     sigWriteNow_(true, *this),
     sigStopAtWriteNow_(true, *this),
 
@@ -651,9 +653,8 @@ Foam::Time::Time
     writeControl_(wcTimeStep),
     writeInterval_(GREAT),
     purgeWrite_(0),
+    subCycling_(0),
     writeOnce_(false),
-    subCycling_(false),
-
     writeFormat_(IOstream::ASCII),
     writeVersion_(IOstream::currentVersion),
     writeCompression_(IOstream::UNCOMPRESSED),
@@ -825,6 +826,12 @@ Foam::dimensionedScalar Foam::Time::endTime() const
 }
 
 
+Foam::Time::stopAtControls Foam::Time::stopAt() const
+{
+    return stopAt_;
+}
+
+
 bool Foam::Time::run() const
 {
     deleteDemandDrivenData(loopProfiling_);
@@ -913,20 +920,23 @@ bool Foam::Time::end() const
 }
 
 
-bool Foam::Time::stopAt(const stopAtControls sa) const
+bool Foam::Time::stopAt(const stopAtControls stopCtrl) const
 {
-    const bool changed = (stopAt_ != sa);
-    stopAt_ = sa;
+    if (stopCtrl == stopAtControls::saUnknown)
+    {
+        return false;
+    }
 
-    // adjust endTime
-    if (sa == saEndTime)
+    const bool changed = (stopAt_ != stopCtrl);
+    stopAt_ = stopCtrl;
+    endTime_ = GREAT;
+
+    // Adjust endTime
+    if (stopCtrl == stopAtControls::saEndTime)
     {
         controlDict_.lookup("endTime") >> endTime_;
     }
-    else
-    {
-        endTime_ = GREAT;
-    }
+
     return changed;
 }
 
@@ -1018,26 +1028,41 @@ void Foam::Time::setDeltaT(const scalar deltaT, const bool adjust)
 
 Foam::TimeState Foam::Time::subCycle(const label nSubCycles)
 {
-    subCycling_ = true;
-    prevTimeState_.reset(new TimeState(*this));
+    prevTimeState_.set(new TimeState(*this));  // Fatal if already set
 
     setTime(*this - deltaT(), (timeIndex() - 1)*nSubCycles);
     deltaT_ /= nSubCycles;
     deltaT0_ /= nSubCycles;
     deltaTSave_ = deltaT0_;
 
+    subCycling_ = nSubCycles;
+
     return prevTimeState();
 }
 
 
+void Foam::Time::subCycleIndex(const label index)
+{
+    // Only permit adjustment if sub-cycling was already active
+    // and if the index is valid (positive, non-zero).
+    // This avoids potential mixups for deleting.
+
+    if (subCycling_ && index > 0)
+    {
+        subCycling_ = index;
+    }
+}
+
+
 void Foam::Time::endSubCycle()
 {
     if (subCycling_)
     {
-        subCycling_ = false;
         TimeState::operator=(prevTimeState());
         prevTimeState_.clear();
     }
+
+    subCycling_ = 0;
 }
 
 
@@ -1113,7 +1138,7 @@ Foam::Time& Foam::Time::operator++()
             case wcRunTime:
             case wcAdjustableRunTime:
             {
-                label writeIndex = label
+                const label writeIndex = label
                 (
                     ((value() - startTime_) + 0.5*deltaT_)
                   / writeInterval_
@@ -1129,7 +1154,7 @@ Foam::Time& Foam::Time::operator++()
 
             case wcCpuTime:
             {
-                label writeIndex = label
+                const label writeIndex = label
                 (
                     returnReduce(elapsedCpuTime(), maxOp<double>())
                   / writeInterval_
@@ -1144,7 +1169,7 @@ Foam::Time& Foam::Time::operator++()
 
             case wcClockTime:
             {
-                label writeIndex = label
+                const label writeIndex = label
                 (
                     returnReduce(label(elapsedClockTime()), maxOp<label>())
                   / writeInterval_
diff --git a/src/OpenFOAM/db/Time/Time.H b/src/OpenFOAM/db/Time/Time.H
index aac5d71738..16b78f40c3 100644
--- a/src/OpenFOAM/db/Time/Time.H
+++ b/src/OpenFOAM/db/Time/Time.H
@@ -75,6 +75,47 @@ class Time
     public objectRegistry,
     public TimeState
 {
+public:
+
+        //- Write control options
+        enum writeControls
+        {
+            wcTimeStep,             //!< "timeStep"
+            wcRunTime,              //!< "runTime"
+            wcAdjustableRunTime,    //!< "adjustableRunTime"
+            wcClockTime,            //!< "clockTime"
+            wcCpuTime               //!< "cpuTime"
+        };
+
+        //- Stop-run control options, which are primarily used when
+        //- altering the stopAt condition.
+        enum stopAtControls
+        {
+            saEndTime,    //!< Stop when Time reaches prescribed endTime
+            saNoWriteNow, //!< Adjust endTime to stop immediately w/o writing
+            saWriteNow,   //!< adjust endTime to stop immediately w/ writing
+            saNextWrite,  //!< stop at the next data write interval
+            saUnknown     //!< Dummy no-op. Do not change current value.
+        };
+
+        //- Supported time directory name formats
+        enum fmtflags
+        {
+            general    = 0,                   //!< default float notation
+            fixed      = ios_base::fixed,     //!< fixed-point notation
+            scientific = ios_base::scientific //!< scientific notation
+        };
+
+
+        //- Names for writeControls
+        static const Enum<writeControls> writeControlNames;
+
+        //- Names for stopAtControls
+        static const Enum<stopAtControls> stopAtControlNames;
+
+
+private:
+
     // Private data
 
         //- Profiling trigger for time-loop (for run, loop)
@@ -88,36 +129,6 @@ class Time
         unwatchedIOdictionary controlDict_;
 
 
-public:
-
-        //- Write control options
-        enum writeControls
-        {
-            wcTimeStep,
-            wcRunTime,
-            wcAdjustableRunTime,
-            wcClockTime,
-            wcCpuTime
-        };
-
-        //- Stop-run control options
-        enum stopAtControls
-        {
-            saEndTime,    //!< stop when Time reaches the prescribed endTime
-            saNoWriteNow, //!< set endTime to stop immediately w/o writing
-            saWriteNow,   //!< set endTime to stop immediately w/ writing
-            saNextWrite   //!< stop the next time data are written
-        };
-
-        //- Supported time directory name formats
-        enum fmtflags
-        {
-            general    = 0,
-            fixed      = ios_base::fixed,
-            scientific = ios_base::scientific
-        };
-
-
 protected:
 
     // Protected data
@@ -126,34 +137,31 @@ protected:
         scalar startTime_;
         mutable scalar endTime_;
 
-        static const Enum<stopAtControls> stopAtControlNames_;
         mutable stopAtControls stopAt_;
 
-        static const Enum<writeControls> writeControlNames_;
         writeControls writeControl_;
 
         scalar writeInterval_;
 
         label  purgeWrite_;
+
         mutable FIFOStack<word> previousWriteTimes_;
 
+        //- The total number of sub-cycles, the current sub-cycle index,
+        //- or 0 if time is not being sub-cycled
+        label subCycling_;
+
         // One-shot writing
         bool writeOnce_;
 
-        //- Is the time currently being sub-cycled?
-        bool subCycling_;
-
         //- If time is being sub-cycled this is the previous TimeState
         autoPtr<TimeState> prevTimeState_;
 
+        //- Signal handler for one-shot writing upon signal
+        sigWriteNow sigWriteNow_;
 
-        // Signal handlers for writing
-
-            //- Enable one-shot writing upon signal
-            sigWriteNow sigWriteNow_;
-
-            //- Enable write and clean exit upon signal
-            sigStopAtWriteNow sigStopAtWriteNow_;
+        //- Signal handler for write and clean exit upon signal
+        sigStopAtWriteNow sigStopAtWriteNow_;
 
 
         //- Time directory name format
@@ -165,6 +173,7 @@ protected:
         //- Maximum time directory name precision
         static const int maxPrecision_;
 
+
         //- Adjust the time step so that writing occurs at the specified time
         void adjustDeltaT();
 
@@ -179,7 +188,7 @@ protected:
         virtual void readDict();
 
         //- Find IOobject in the objectPath
-        static bool exists(IOobject&);
+        static bool exists(IOobject& io);
 
 
 private:
@@ -423,6 +432,9 @@ public:
             //- Return end time
             virtual dimensionedScalar endTime() const;
 
+            //- Return the stop control information
+            virtual stopAtControls stopAt() const;
+
             //- Return the list of function objects
             const functionObjectList& functionObjects() const
             {
@@ -441,8 +453,12 @@ public:
                 return libs_;
             }
 
-            //- Return true if time currently being sub-cycled, otherwise false
-            bool subCycling() const
+            //- Zero (tests as false) if time is not being sub-cycled,
+            //- otherwise the current sub-cycle index or the total number of
+            //- sub-cycles.
+            //  The interpretation of non-zero values is dependent on the
+            //  routine.
+            label subCycling() const
             {
                 return subCycling_;
             }
@@ -498,10 +514,13 @@ public:
 
         // Edit
 
-            //- Adjust the current stopAtControl. Note that this value
-            //  only persists until the next time the dictionary is read.
-            //  Return true if the stopAtControl changed.
-            virtual bool stopAt(const stopAtControls sa) const;
+            //- Adjust the current stopAtControl.
+            //  \param stopCtrl the new stop control, whereby
+            //      stopAtControls::saUnknown is treated as a no-op.
+            //  \note this value only persists until the next time the
+            //      dictionary is read.
+            //  \return true if the stopAt() value was changed.
+            virtual bool stopAt(const stopAtControls stopCtrl) const;
 
             //- Reset the time and time-index to those of the given time
             virtual void setTime(const Time& t);
@@ -542,6 +561,13 @@ public:
             //- Set time to sub-cycle for the given number of steps
             virtual TimeState subCycle(const label nSubCycles);
 
+            //- Adjust the reported sub-cycle index.
+            //  \param index is the sub-cycle index.
+            //      This index is ignored sub-cycling was
+            //      not already registered, or if the index is zero or
+            //      negative.
+            virtual void subCycleIndex(const label index);
+
             //- Reset time after sub-cycling back to previous TimeState
             virtual void endSubCycle();
 
diff --git a/src/OpenFOAM/db/Time/TimeIO.C b/src/OpenFOAM/db/Time/TimeIO.C
index f310efdde7..9379be5df9 100644
--- a/src/OpenFOAM/db/Time/TimeIO.C
+++ b/src/OpenFOAM/db/Time/TimeIO.C
@@ -240,7 +240,7 @@ void Foam::Time::readDict()
 
     if (controlDict_.found("writeControl"))
     {
-        writeControl_ = writeControlNames_.lookup
+        writeControl_ = writeControlNames.lookup
         (
             "writeControl",
             controlDict_
@@ -328,7 +328,7 @@ void Foam::Time::readDict()
     // if nothing is specified, the endTime is zero
     if (controlDict_.found("stopAt"))
     {
-        stopAt_ = stopAtControlNames_.lookup("stopAt", controlDict_);
+        stopAt_ = stopAtControlNames.lookup("stopAt", controlDict_);
 
         if (stopAt_ == saEndTime)
         {
@@ -439,10 +439,8 @@ bool Foam::Time::read()
 
         return true;
     }
-    else
-    {
-        return false;
-    }
+
+    return false;
 }
 
 
@@ -567,10 +565,8 @@ bool Foam::Time::writeObject
 
         return writeOK;
     }
-    else
-    {
-        return false;
-    }
+
+    return false;
 }
 
 
diff --git a/src/OpenFOAM/db/Time/subCycleTime.C b/src/OpenFOAM/db/Time/subCycleTime.C
index fcfb07df63..b4a2498fad 100644
--- a/src/OpenFOAM/db/Time/subCycleTime.C
+++ b/src/OpenFOAM/db/Time/subCycleTime.C
@@ -27,13 +27,14 @@ License
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
-Foam::subCycleTime::subCycleTime(Time& t, const label nSubCycles)
+Foam::subCycleTime::subCycleTime(Time& runTime, const label nCycles)
 :
-    time_(t),
-    nSubCycles_(nSubCycles),
-    subCycleIndex_(0)
+    time_(runTime),
+    index_(0),
+    total_(nCycles)
 {
-    time_.subCycle(nSubCycles_);
+    // Could avoid 0 or 1 nCycles here on construction
+    time_.subCycle(nCycles);
 }
 
 
@@ -47,15 +48,38 @@ Foam::subCycleTime::~subCycleTime()
 
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
+bool Foam::subCycleTime::status() const
+{
+    return (index_ <= total_);
+}
+
+
 bool Foam::subCycleTime::end() const
 {
-    return subCycleIndex_ > nSubCycles_;
+    return (index_ > total_);  // or !(status())
 }
 
 
 void Foam::subCycleTime::endSubCycle()
 {
     time_.endSubCycle();
+
+    // If called manually, ensure status() will return false
+
+    index_ = total_ + 1;
+}
+
+
+bool Foam::subCycleTime::loop()
+{
+    const bool active = status();
+
+    if (active)
+    {
+        operator++();
+    }
+
+    return active;
 }
 
 
@@ -63,8 +87,12 @@ void Foam::subCycleTime::endSubCycle()
 
 Foam::subCycleTime& Foam::subCycleTime::operator++()
 {
-    time_++;
-    subCycleIndex_++;
+    ++time_;
+    ++index_;
+
+    // Register index change with Time, in case someone wants this information
+    time_.subCycleIndex(index_);
+
     return *this;
 }
 
diff --git a/src/OpenFOAM/db/Time/subCycleTime.H b/src/OpenFOAM/db/Time/subCycleTime.H
index 9bec0326f6..cceeaded3f 100644
--- a/src/OpenFOAM/db/Time/subCycleTime.H
+++ b/src/OpenFOAM/db/Time/subCycleTime.H
@@ -50,17 +50,22 @@ class subCycleTime
 {
     // Private data
 
+        //- Reference to the underlying time
         Time& time_;
 
-        label nSubCycles_;
-        label subCycleIndex_;
+        //- Current index in the sub-cycle
+        label index_;
+
+        //- Total number of cycles in the sub-cycle
+        label total_;
+
 
 public:
 
     // Constructors
 
-        //- Construct from original time and number of sub-cycles
-        subCycleTime(Time&, const label nSubCycles);
+        //- Construct referencing the original time and number of sub-cycles
+        subCycleTime(Time& runTime, const label nCycle);
 
 
     //- Destructor
@@ -69,23 +74,36 @@ public:
 
     // Member functions
 
+        //- Return the current sub-cycle index
+        inline label index() const
+        {
+            return index_;
+        }
+
+        //- Return the total number of sub-cycles
+        inline label nSubCycles() const
+        {
+            return total_;
+        }
+
+        //- True if the sub-cycle is active.
+        bool status() const;
+
         //- Return true if the number of sub-cycles has been reached
         bool end() const;
 
         //- End the sub-cycling and reset the time-state
         void endSubCycle();
 
-        //- Return the total number of sub-cycles
-        label nSubCycles() const
-        {
-            return nSubCycles_;
-        }
-
-        //- Return the current sub-cycle index
-        label index() const
-        {
-            return subCycleIndex_;
-        }
+        //- True if looping is active, increments the index.
+        //  Example usage,
+        //  \code
+        //      while (subcycle.loop())
+        //      {
+        //          solve;
+        //      }
+        //  \endcode
+        bool loop();
 
 
     // Member operators
@@ -93,7 +111,7 @@ public:
         //- Prefix increment
         subCycleTime& operator++();
 
-        //- Postfix increment
+        //- Postfix increment, this is identical to the prefix increment
         subCycleTime& operator++(int);
 };
 
diff --git a/src/functionObjects/utilities/abort/abort.C b/src/functionObjects/utilities/abort/abort.C
index b74dd88896..560e4411f1 100644
--- a/src/functionObjects/utilities/abort/abort.C
+++ b/src/functionObjects/utilities/abort/abort.C
@@ -49,18 +49,6 @@ namespace functionObjects
 }
 
 
-const Foam::Enum
-<
-    Foam::Time::stopAtControls
->
-Foam::functionObjects::abort::actionNames_
-{
-    { Time::stopAtControls::saNoWriteNow, "noWriteNow" },
-    { Time::stopAtControls::saWriteNow, "writeNow" },
-    { Time::stopAtControls::saNextWrite, "nextWrite" },
-};
-
-
 // * * * * * * * * * * * * * * * Local Functions * * * * * * * * * * * * * * //
 
 // file-scope
@@ -126,12 +114,6 @@ Foam::functionObjects::abort::abort
 }
 
 
-// * * * * * * * * * * * * * * * * Destructor  * * * * * * * * * * * * * * * //
-
-Foam::functionObjects::abort::~abort()
-{}
-
-
 // * * * * * * * * * * * * * * * Member Functions  * * * * * * * * * * * * * //
 
 bool Foam::functionObjects::abort::read(const dictionary& dict)
@@ -145,7 +127,7 @@ bool Foam::functionObjects::abort::read(const dictionary& dict)
 
     const auto oldAction = action_;
 
-    action_ = actionNames_.lookupOrDefault
+    action_ = Time::stopAtControlNames.lookupOrDefault
     (
         "action",
         dict,
diff --git a/src/functionObjects/utilities/abort/abort.H b/src/functionObjects/utilities/abort/abort.H
index bf891fd6a7..ce88b6264c 100644
--- a/src/functionObjects/utilities/abort/abort.H
+++ b/src/functionObjects/utilities/abort/abort.H
@@ -30,6 +30,7 @@ Group
 Description
     Watches for presence of the named file in the $FOAM_CASE directory
     and aborts the calculation if it is present.
+
     The presence of the abort file is only checked on the master process.
 
     Currently the following action types are supported:
@@ -73,9 +74,6 @@ class abort
 {
     // Private data
 
-        //- A subset of Time stopAtControls
-        static const Enum<Time::stopAtControls> actionNames_;
-
         //- Reference to the Time
         const Time& time_;
 
@@ -116,7 +114,7 @@ public:
 
 
     //- Destructor
-    virtual ~abort();
+    virtual ~abort() = default;
 
 
     // Member Functions