diff --git a/tutorials/lagrangian/coalChemistryFoam/simplifiedSiwek/constant/coalCloud1Properties b/tutorials/lagrangian/coalChemistryFoam/simplifiedSiwek/constant/coalCloud1Properties
index 00df650cbe3489cd51851e544b1a4f95b8f474c9..8b4ca414ad9d1e1af27ab0c99832907a5217c7ab 100644
--- a/tutorials/lagrangian/coalChemistryFoam/simplifiedSiwek/constant/coalCloud1Properties
+++ b/tutorials/lagrangian/coalChemistryFoam/simplifiedSiwek/constant/coalCloud1Properties
@@ -24,21 +24,12 @@ solution
 
     sourceTerms
     {
-        rho
+        schemes
         {
-            semiImplicit    false;
-        }
-        U
-        {
-            semiImplicit    false;
-        }
-        Yi
-        {
-            semiImplicit    false;
-        }
-        hs
-        {
-            semiImplicit    false;
+            rho             explicit;
+            U               explicit;
+            Yi              explicit;
+            hs              explicit;
         }
     }
 
diff --git a/tutorials/lagrangian/coalChemistryFoam/simplifiedSiwek/constant/limestoneCloud1Properties b/tutorials/lagrangian/coalChemistryFoam/simplifiedSiwek/constant/limestoneCloud1Properties
index de4b6e4f21bf4392bff2a5c15d6cf861fcb27140..7676293a7538f163a797f4354a7207fccaa913a7 100644
--- a/tutorials/lagrangian/coalChemistryFoam/simplifiedSiwek/constant/limestoneCloud1Properties
+++ b/tutorials/lagrangian/coalChemistryFoam/simplifiedSiwek/constant/limestoneCloud1Properties
@@ -24,13 +24,10 @@ solution
 
     sourceTerms
     {
-        U
+        schemes
         {
-            semiImplicit    false;
-        }
-        hs
-        {
-            semiImplicit    false;
+            U               explicit;
+            hs              explicit;
         }
     }
 
diff --git a/tutorials/lagrangian/porousExplicitSourceReactingParcelFoam/filter/constant/reactingCloud1Properties b/tutorials/lagrangian/porousExplicitSourceReactingParcelFoam/filter/constant/reactingCloud1Properties
index ce3b2863d96a1a49c3c99cfd6043599b6604e7f4..c1025505b5359614840f228155d46fcb22f61181 100644
--- a/tutorials/lagrangian/porousExplicitSourceReactingParcelFoam/filter/constant/reactingCloud1Properties
+++ b/tutorials/lagrangian/porousExplicitSourceReactingParcelFoam/filter/constant/reactingCloud1Properties
@@ -24,21 +24,12 @@ solution
 
     sourceTerms
     {
-        rho
+        schemes
         {
-            semiImplicit    false;
-        }
-        U
-        {
-            semiImplicit    false;
-        }
-        Yi
-        {
-            semiImplicit    false;
-        }
-        hs
-        {
-            semiImplicit    false;
+            rho             explicit;
+            U               explicit;
+            Yi              explicit;
+            hs              explicit;
         }
     }
 
diff --git a/tutorials/lagrangian/porousExplicitSourceReactingParcelFoam/parcelInBox/constant/reactingCloud1Properties b/tutorials/lagrangian/porousExplicitSourceReactingParcelFoam/parcelInBox/constant/reactingCloud1Properties
index d4295fefe2cc905ab18a716ba86eb95e8b9553e4..db94abd0f832b7dc907dc9e2d8158f893c0fd397 100644
--- a/tutorials/lagrangian/porousExplicitSourceReactingParcelFoam/parcelInBox/constant/reactingCloud1Properties
+++ b/tutorials/lagrangian/porousExplicitSourceReactingParcelFoam/parcelInBox/constant/reactingCloud1Properties
@@ -24,21 +24,12 @@ solution
 
     sourceTerms
     {
-        rho
+        schemes
         {
-            semiImplicit    false;
-        }
-        U
-        {
-            semiImplicit    false;
-        }
-        Yi
-        {
-            semiImplicit    false;
-        }
-        hs
-        {
-            semiImplicit    false;
+            rho             explicit;
+            U               explicit;
+            Yi              explicit;
+            hs              explicit;
         }
     }
 
diff --git a/tutorials/lagrangian/porousExplicitSourceReactingParcelFoam/verticalChannel/constant/reactingCloud1Properties b/tutorials/lagrangian/porousExplicitSourceReactingParcelFoam/verticalChannel/constant/reactingCloud1Properties
index f5665ebdc4340e4b2f5254c3a6a986f7737e458a..4d8a02f0bb2b882dd5e86a710c219508f2b5d9b8 100644
--- a/tutorials/lagrangian/porousExplicitSourceReactingParcelFoam/verticalChannel/constant/reactingCloud1Properties
+++ b/tutorials/lagrangian/porousExplicitSourceReactingParcelFoam/verticalChannel/constant/reactingCloud1Properties
@@ -24,21 +24,12 @@ solution
 
     sourceTerms
     {
-        rho
+        schemes
         {
-            semiImplicit    false;
-        }
-        U
-        {
-            semiImplicit    false;
-        }
-        Yi
-        {
-            semiImplicit    false;
-        }
-        hs
-        {
-            semiImplicit    false;
+            rho             explicit;
+            U               explicit;
+            Yi              explicit;
+            hs              explicit;
         }
     }
 
diff --git a/tutorials/lagrangian/reactingParcelFoam/evaporationTest/constant/reactingCloud1Properties b/tutorials/lagrangian/reactingParcelFoam/evaporationTest/constant/reactingCloud1Properties
index 5e9e99481ae04bc77ea22614cda50ad212aa0ca5..f49cbb914f303ecb5999cab12517e567ef307bdd 100644
--- a/tutorials/lagrangian/reactingParcelFoam/evaporationTest/constant/reactingCloud1Properties
+++ b/tutorials/lagrangian/reactingParcelFoam/evaporationTest/constant/reactingCloud1Properties
@@ -24,21 +24,12 @@ solution
 
     sourceTerms
     {
-        rho
+        schemes
         {
-            semiImplicit    false;
-        }
-        U
-        {
-            semiImplicit    false;
-        }
-        Yi
-        {
-            semiImplicit    false;
-        }
-        hs
-        {
-            semiImplicit    false;
+            rho             explicit;
+            U               explicit;
+            Yi              explicit;
+            hs              explicit;
         }
     }
 
diff --git a/tutorials/lagrangian/rhoPisoTwinParcelFoam/simplifiedSiwek/constant/kinematicCloud1Properties b/tutorials/lagrangian/rhoPisoTwinParcelFoam/simplifiedSiwek/constant/kinematicCloud1Properties
index 5805622a31d4350dd4e8ea0775aed4f0421091d8..f5de50c4ca95ed079e322cfff590d0c2e0104dfe 100644
--- a/tutorials/lagrangian/rhoPisoTwinParcelFoam/simplifiedSiwek/constant/kinematicCloud1Properties
+++ b/tutorials/lagrangian/rhoPisoTwinParcelFoam/simplifiedSiwek/constant/kinematicCloud1Properties
@@ -24,9 +24,9 @@ solution
 
     sourceTerms
     {
-        U
+        schemes
         {
-            semiImplicit    false;
+            U               explicit;
         }
     }
 
diff --git a/tutorials/lagrangian/rhoPisoTwinParcelFoam/simplifiedSiwek/constant/thermoCloud1Properties b/tutorials/lagrangian/rhoPisoTwinParcelFoam/simplifiedSiwek/constant/thermoCloud1Properties
index 8fc1578e36922704f37d869703b3254cd3d95e46..01cc6bd7b0b4be50f868601b8d6e9f9e669f8c78 100644
--- a/tutorials/lagrangian/rhoPisoTwinParcelFoam/simplifiedSiwek/constant/thermoCloud1Properties
+++ b/tutorials/lagrangian/rhoPisoTwinParcelFoam/simplifiedSiwek/constant/thermoCloud1Properties
@@ -24,13 +24,10 @@ solution
 
     sourceTerms
     {
-        U
+        schemes
         {
-            semiImplicit    false;
-        }
-        hs
-        {
-            semiImplicit    false;
+            U               explicit;
+            hs              explicit;
         }
     }
 
diff --git a/tutorials/lagrangian/steadyReactingParcelFoam/verticalChannel/constant/reactingCloud1Properties b/tutorials/lagrangian/steadyReactingParcelFoam/verticalChannel/constant/reactingCloud1Properties
index 9ab2fcf8aef880f5087abdd8d38c7abdf58e8d4e..7137bf6f17acdfebc1c94fa72fc58e56f1976065 100644
--- a/tutorials/lagrangian/steadyReactingParcelFoam/verticalChannel/constant/reactingCloud1Properties
+++ b/tutorials/lagrangian/steadyReactingParcelFoam/verticalChannel/constant/reactingCloud1Properties
@@ -30,24 +30,12 @@ solution
     sourceTerms
     {
         resetOnStartup  false;
-        U
+        schemes
         {
-            alpha           1;
-            semiImplicit    true;
-        }
-        hs
-        {
-            alpha           1;
-            semiImplicit    true;
-        }
-        rho
-        {
-            alpha           1;
-            semiImplicit    false;
-        }
-        Yi
-        {
-            semiImplicit    true;
+            rho             semiImplicit 1;
+            U               semiImplicit 1;
+            Yi              semiImplicit 1;
+            hs              semiImplicit 1;
         }
     }