diff --git a/modules/navier_stokes/src/actions/NSFVAction.C b/modules/navier_stokes/src/actions/NSFVAction.C
index 137a93ab264b..5510319780b4 100644
--- a/modules/navier_stokes/src/actions/NSFVAction.C
+++ b/modules/navier_stokes/src/actions/NSFVAction.C
@@ -2308,12 +2308,16 @@ NSFVAction::addRelationshipManagers(Moose::RelationshipManagerType input_rm_type
 void
 NSFVAction::processMesh()
 {
-  _dim = _mesh->dimension();
   _problem->needFV();
 
   // If the user doesn't define a block name we go with the default
   if (!_blocks.size())
+  {
     _blocks.push_back("ANY_BLOCK_ID");
+    _dim = _mesh->dimension();
+  }
+  else
+    _dim = _mesh->getBlocksDimension(_blocks);
 }
 
 void
diff --git a/modules/navier_stokes/src/materials/PINSFVSpeedFunctorMaterial.C b/modules/navier_stokes/src/materials/PINSFVSpeedFunctorMaterial.C
index cfdda58ea779..9a0536992b92 100644
--- a/modules/navier_stokes/src/materials/PINSFVSpeedFunctorMaterial.C
+++ b/modules/navier_stokes/src/materials/PINSFVSpeedFunctorMaterial.C
@@ -44,11 +44,11 @@ PINSFVSpeedFunctorMaterial::PINSFVSpeedFunctorMaterial(const InputParameters & p
       parameters.isParamSetByUser(NS::superficial_velocity_x) +
       parameters.isParamSetByUser(NS::superficial_velocity_y) +
       parameters.isParamSetByUser(NS::superficial_velocity_z);
-  if (num_components_specified != _mesh.dimension())
+  if (num_components_specified != blocksDimension())
     mooseError("Only ",
                num_components_specified,
                " superficial velocity components were provided for a mesh of dimension ",
-               _mesh.dimension());
+               blocksDimension());
 
   // Interstitial velocity is needed by certain correlations
   addFunctorProperty<ADRealVectorValue>(NS::velocity,
diff --git a/modules/navier_stokes/src/userobjects/INSFVRhieChowInterpolator.C b/modules/navier_stokes/src/userobjects/INSFVRhieChowInterpolator.C
index 24cdb6fe92ad..b5cea49e75cc 100644
--- a/modules/navier_stokes/src/userobjects/INSFVRhieChowInterpolator.C
+++ b/modules/navier_stokes/src/userobjects/INSFVRhieChowInterpolator.C
@@ -93,7 +93,7 @@ INSFVRhieChowInterpolator::INSFVRhieChowInterpolator(const InputParameters & par
     ADFunctorInterface(this),
     _moose_mesh(UserObject::_subproblem.mesh()),
     _mesh(_moose_mesh.getMesh()),
-    _dim(_moose_mesh.dimension()),
+    _dim(blocksDimension()),
     _vel(libMesh::n_threads()),
     _p(dynamic_cast<INSFVPressureVariable *>(
         &UserObject::_subproblem.getVariable(0, getParam<VariableName>(NS::pressure)))),