Explicitly add implicit bounce back bc

src/gpu/VirtualFluids_GPU/BoundaryConditions/BoundaryConditionFactory.cpp

@@ -61,6 +61,9 @@ boundaryCondition BoundaryConditionFactory::getNoSlipBoundaryConditionPost(bool
 
     // for descriptions of the boundary conditions refer to the header
     switch (boundaryCondition) {
+        case NoSlipBC::NoSlipImplicitBounceBack:
+            return [] (LBMSimulationParameter *, QforBoundaryConditions *) {};
+            break;
         case NoSlipBC::NoSlipBounceBack:
             return BBDev27;
             break;

src/gpu/VirtualFluids_GPU/BoundaryConditions/BoundaryConditionFactory.h

@@ -31,6 +31,8 @@ public:
 
     //! \brief An enumeration for selecting a no-slip boundary condition
     enum class NoSlipBC {
+        //! - NoSlipImplicitBounceBack = implicit bounce back by Esoteric Twist
+        NoSlipImplicitBounceBack,
         //! - NoSlipBounceBack = bounce back no-slip boundary condition
         NoSlipBounceBack,
         //! - NoSlipIncompressible = interpolated no-slip boundary condition, based on subgrid distances