fix order of construction / destruction

dataExchangeModel is needed by the destructor of several models, thus
should be destroyed last and in further consequence must be constructed
first

src/lagrangian/cfdemParticle/cfdemCloud/cfdemCloud.C

@@ -155,6 +155,14 @@ cfdemCloud::cfdemCloud
             turbulenceModelType_
         )
     ),
+    dataExchangeModel_
+    (
+        dataExchangeModel::New
+        (
+            couplingProperties_,
+            *this
+        )
+    ),
     forceModel_(nrForceModels()),
     locateModel_
     (
@@ -165,14 +173,6 @@ cfdemCloud::cfdemCloud
         )
     ),
     momCoupleModel_(nrMomCoupleModels()),
-    dataExchangeModel_
-    (
-        dataExchangeModel::New
-        (
-            couplingProperties_,
-            *this
-        )
-    ),
     IOModel_
     (
         IOModel::New

src/lagrangian/cfdemParticle/cfdemCloud/cfdemCloud.H

@@ -180,14 +180,14 @@ protected:
 
     const turbulenceModel& turbulence_;
 
+    autoPtr<dataExchangeModel> dataExchangeModel_;
+
     PtrList<forceModel> forceModel_;
 
     autoPtr<locateModel> locateModel_;
 
     PtrList<momCoupleModel> momCoupleModel_;
 
-    autoPtr<dataExchangeModel> dataExchangeModel_;
-
     autoPtr<IOModel> IOModel_;
 
     autoPtr<probeModel> probeModel_;