diff --git a/tutorials/compressible/rhoPorousSimpleFoam/angledDuctExplicit/system/fvSolution b/tutorials/compressible/rhoPorousSimpleFoam/angledDuctExplicit/system/fvSolution
index e2bc9c870d..a61ae9a85d 100644
--- a/tutorials/compressible/rhoPorousSimpleFoam/angledDuctExplicit/system/fvSolution
+++ b/tutorials/compressible/rhoPorousSimpleFoam/angledDuctExplicit/system/fvSolution
@@ -23,7 +23,7 @@ solvers
         tolerance       1e-08;
         relTol          0.05;
         smoother        GaussSeidel;
-        cacheAgglomeration off;
+        cacheAgglomeration on;
         nCellsInCoarsestLevel 20;
         agglomerator    faceAreaPair;
         mergeLevels     1;
diff --git a/tutorials/compressible/rhoPorousSimpleFoam/angledDuctImplicit/system/fvSolution b/tutorials/compressible/rhoPorousSimpleFoam/angledDuctImplicit/system/fvSolution
index 1fb7a16e85..13a08e5e1b 100644
--- a/tutorials/compressible/rhoPorousSimpleFoam/angledDuctImplicit/system/fvSolution
+++ b/tutorials/compressible/rhoPorousSimpleFoam/angledDuctImplicit/system/fvSolution
@@ -23,7 +23,7 @@ solvers
         tolerance       1e-08;
         relTol          0.05;
         smoother        GaussSeidel;
-        cacheAgglomeration off;
+        cacheAgglomeration on;
         nCellsInCoarsestLevel 20;
         agglomerator    faceAreaPair;
         mergeLevels     1;
diff --git a/tutorials/compressible/rhoSimpleFoam/angledDuctExplicitFixedCoeff/system/fvSolution b/tutorials/compressible/rhoSimpleFoam/angledDuctExplicitFixedCoeff/system/fvSolution
index 25b10212a3..c259abc052 100644
--- a/tutorials/compressible/rhoSimpleFoam/angledDuctExplicitFixedCoeff/system/fvSolution
+++ b/tutorials/compressible/rhoSimpleFoam/angledDuctExplicitFixedCoeff/system/fvSolution
@@ -23,7 +23,7 @@ solvers
         tolerance       1e-08;
         relTol          0.05;
         smoother        GaussSeidel;
-        cacheAgglomeration off;
+        cacheAgglomeration on;
         nCellsInCoarsestLevel 20;
         agglomerator    faceAreaPair;
         mergeLevels     1;
diff --git a/tutorials/incompressible/porousSimpleFoam/angledDuctExplicit/system/fvSolution b/tutorials/incompressible/porousSimpleFoam/angledDuctExplicit/system/fvSolution
index 7b598444f7..3feda21ae1 100644
--- a/tutorials/incompressible/porousSimpleFoam/angledDuctExplicit/system/fvSolution
+++ b/tutorials/incompressible/porousSimpleFoam/angledDuctExplicit/system/fvSolution
@@ -23,7 +23,7 @@ solvers
         tolerance       1e-08;
         relTol          0.05;
         smoother        GaussSeidel;
-        cacheAgglomeration off;
+        cacheAgglomeration on;
         nCellsInCoarsestLevel 20;
         agglomerator    faceAreaPair;
         mergeLevels     1;
diff --git a/tutorials/incompressible/porousSimpleFoam/angledDuctImplicit/system/fvSolution b/tutorials/incompressible/porousSimpleFoam/angledDuctImplicit/system/fvSolution
index 27f43cb0bd..e0337498e5 100644
--- a/tutorials/incompressible/porousSimpleFoam/angledDuctImplicit/system/fvSolution
+++ b/tutorials/incompressible/porousSimpleFoam/angledDuctImplicit/system/fvSolution
@@ -23,7 +23,7 @@ solvers
         tolerance       1e-08;
         relTol          0.05;
         smoother        GaussSeidel;
-        cacheAgglomeration off;
+        cacheAgglomeration on;
         nCellsInCoarsestLevel 20;
         agglomerator    faceAreaPair;
         mergeLevels     1;
diff --git a/tutorials/incompressible/porousSimpleFoam/straightDuctImplicit/system/fvSolution b/tutorials/incompressible/porousSimpleFoam/straightDuctImplicit/system/fvSolution
index 27f43cb0bd..688dee189f 100644
--- a/tutorials/incompressible/porousSimpleFoam/straightDuctImplicit/system/fvSolution
+++ b/tutorials/incompressible/porousSimpleFoam/straightDuctImplicit/system/fvSolution
@@ -23,7 +23,7 @@ solvers
         tolerance       1e-08;
         relTol          0.05;
         smoother        GaussSeidel;
-        cacheAgglomeration off;
+        cacheAgglomeration on;
         nCellsInCoarsestLevel 20;
         agglomerator    faceAreaPair;
         mergeLevels     1;
@@ -32,7 +32,7 @@ solvers
     "(U|k|epsilon)"
     {
         solver          smoothSolver;
-        smoother        GaussSeidel;
+        smoother        symGaussSeidel;
         nSweeps         2;
         tolerance       1e-07;
         relTol          0.1;
diff --git a/tutorials/lagrangian/coalChemistryFoam/simplifiedSiwek/system/fvSolution b/tutorials/lagrangian/coalChemistryFoam/simplifiedSiwek/system/fvSolution
index b30a44e775..23f65f64b3 100644
--- a/tutorials/lagrangian/coalChemistryFoam/simplifiedSiwek/system/fvSolution
+++ b/tutorials/lagrangian/coalChemistryFoam/simplifiedSiwek/system/fvSolution
@@ -41,7 +41,7 @@ solvers
         nPreSweeps      0;
         nPostSweeps     2;
         nFinestSweeps   2;
-        cacheAgglomeration false;
+        cacheAgglomeration on;
         nCellsInCoarsestLevel 10;
         agglomerator    faceAreaPair;
         mergeLevels     1;
diff --git a/tutorials/multiphase/compressibleInterFoam/laminar/depthCharge2D/system/fvSolution b/tutorials/multiphase/compressibleInterFoam/laminar/depthCharge2D/system/fvSolution
index 60308edee5..62218a50fb 100644
--- a/tutorials/multiphase/compressibleInterFoam/laminar/depthCharge2D/system/fvSolution
+++ b/tutorials/multiphase/compressibleInterFoam/laminar/depthCharge2D/system/fvSolution
@@ -41,7 +41,7 @@ solvers
             nPreSweeps      0;
             nPostSweeps     2;
             nFinestSweeps   2;
-            cacheAgglomeration false;
+            cacheAgglomeration true;
             nCellsInCoarsestLevel 10;
             agglomerator    faceAreaPair;
             mergeLevels     1;
diff --git a/tutorials/multiphase/compressibleInterFoam/laminar/depthCharge3D/system/fvSolution b/tutorials/multiphase/compressibleInterFoam/laminar/depthCharge3D/system/fvSolution
index 7a04bf3624..563ce52459 100644
--- a/tutorials/multiphase/compressibleInterFoam/laminar/depthCharge3D/system/fvSolution
+++ b/tutorials/multiphase/compressibleInterFoam/laminar/depthCharge3D/system/fvSolution
@@ -36,7 +36,7 @@ solvers
             nPreSweeps      0;
             nPostSweeps     2;
             nFinestSweeps   2;
-            cacheAgglomeration false;
+            cacheAgglomeration true;
             nCellsInCoarsestLevel 10;
             agglomerator    faceAreaPair;
             mergeLevels     1;
diff --git a/tutorials/multiphase/compressibleMultiphaseInterFoam/laminar/damBreak4phase/system/fvSolution b/tutorials/multiphase/compressibleMultiphaseInterFoam/laminar/damBreak4phase/system/fvSolution
index 6f88113f81..bd2ac2e9f9 100644
--- a/tutorials/multiphase/compressibleMultiphaseInterFoam/laminar/damBreak4phase/system/fvSolution
+++ b/tutorials/multiphase/compressibleMultiphaseInterFoam/laminar/damBreak4phase/system/fvSolution
@@ -29,10 +29,10 @@ solvers
             nPreSweeps      0;
             nPostSweeps     2;
             nFinestSweeps   2;
-            cacheAgglomeration off;
+            cacheAgglomeration on;
             nCellsInCoarsestLevel 10;
             agglomerator    faceAreaPair;
-            mergeLevels     2;
+            mergeLevels     1;
         }
         tolerance       1e-05;
         relTol          0;
diff --git a/tutorials/multiphase/interFoam/les/nozzleFlow2D/system/fvSolution b/tutorials/multiphase/interFoam/les/nozzleFlow2D/system/fvSolution
index 479dee58a2..cb839db99a 100644
--- a/tutorials/multiphase/interFoam/les/nozzleFlow2D/system/fvSolution
+++ b/tutorials/multiphase/interFoam/les/nozzleFlow2D/system/fvSolution
@@ -36,7 +36,7 @@ solvers
             nPreSweeps      0;
             nPostSweeps     2;
             nFinestSweeps   2;
-            cacheAgglomeration false;
+            cacheAgglomeration true;
             nCellsInCoarsestLevel 10;
             agglomerator    faceAreaPair;
             mergeLevels     1;
diff --git a/tutorials/multiphase/interFoam/ras/waterChannel/LTSInterFoam/system/fvSolution b/tutorials/multiphase/interFoam/ras/waterChannel/LTSInterFoam/system/fvSolution
index cc69de4db5..1dd68d3063 100644
--- a/tutorials/multiphase/interFoam/ras/waterChannel/LTSInterFoam/system/fvSolution
+++ b/tutorials/multiphase/interFoam/ras/waterChannel/LTSInterFoam/system/fvSolution
@@ -36,7 +36,7 @@ solvers
             nPreSweeps      0;
             nPostSweeps     2;
             nFinestSweeps   2;
-            cacheAgglomeration false;
+            cacheAgglomeration true;
             nCellsInCoarsestLevel 10;
             agglomerator    faceAreaPair;
             mergeLevels     1;
diff --git a/tutorials/multiphase/interFoam/ras/waterChannel/system/fvSolution b/tutorials/multiphase/interFoam/ras/waterChannel/system/fvSolution
index 1a7bff2000..ba6bfb0754 100644
--- a/tutorials/multiphase/interFoam/ras/waterChannel/system/fvSolution
+++ b/tutorials/multiphase/interFoam/ras/waterChannel/system/fvSolution
@@ -44,7 +44,7 @@ solvers
             nPreSweeps      0;
             nPostSweeps     2;
             nFinestSweeps   2;
-            cacheAgglomeration false;
+            cacheAgglomeration true;
             nCellsInCoarsestLevel 10;
             agglomerator    faceAreaPair;
             mergeLevels     1;
diff --git a/tutorials/multiphase/interPhaseChangeFoam/cavitatingBullet/system/fvSolution b/tutorials/multiphase/interPhaseChangeFoam/cavitatingBullet/system/fvSolution
index f19f2cd8b2..6e09921b2e 100644
--- a/tutorials/multiphase/interPhaseChangeFoam/cavitatingBullet/system/fvSolution
+++ b/tutorials/multiphase/interPhaseChangeFoam/cavitatingBullet/system/fvSolution
@@ -81,7 +81,7 @@ solvers
             nPostSweeps      2;
             nFinestSweeps    2;
 
-            cacheAgglomeration false;
+            cacheAgglomeration true;
             nCellsInCoarsestLevel 10;
             agglomerator     faceAreaPair;
             mergeLevels      1;