INCINLET_USENORMALS uses normal of inlet boundary for velocity inlets…

… in addition to pressure inlets (#1643)

* bugfix for incinlet_usenormals - now also used for velocity inlets

SU2_CFD/src/solvers/CIncEulerSolver.cpp

@@ -2199,10 +2199,17 @@ void CIncEulerSolver::BC_Inlet(CGeometry *geometry, CSolver **solver_container,
     Flow_Dir = Inlet_FlowDir[val_marker][iVertex];
     Flow_Dir_Mag = GeometryToolbox::Norm(nDim, Flow_Dir);
 
-    /*--- Store the unit flow direction vector. ---*/
+    /*--- Store the unit flow direction vector. 
+     If requested, use the local boundary normal (negative),
+     instead of the prescribed flow direction in the config. ---*/
 
-    for (iDim = 0; iDim < nDim; iDim++)
-      UnitFlowDir[iDim] = Flow_Dir[iDim]/Flow_Dir_Mag;
+    if (config->GetInc_Inlet_UseNormal()) {
+      for (iDim = 0; iDim < nDim; iDim++)
+        UnitFlowDir[iDim] = -Normal[iDim]/Area;
+    } else {
+      for (iDim = 0; iDim < nDim; iDim++)
+        UnitFlowDir[iDim] = Flow_Dir[iDim]/Flow_Dir_Mag;
+    }
 
     /*--- Retrieve solution at this boundary node. ---*/
 
@@ -2278,14 +2285,6 @@ void CIncEulerSolver::BC_Inlet(CGeometry *geometry, CSolver **solver_container,
 
           Vel_Mag = sqrt((P_total - P_domain)/(0.5*nodes->GetDensity(iPoint)));
 
-          /*--- If requested, use the local boundary normal (negative),
-           instead of the prescribed flow direction in the config. ---*/
-
-          if (config->GetInc_Inlet_UseNormal()) {
-            for (iDim = 0; iDim < nDim; iDim++)
-              UnitFlowDir[iDim] = -Normal[iDim]/Area;
-          }
-
           /*--- Compute the delta change in velocity in each direction. ---*/
 
           for (iDim = 0; iDim < nDim; iDim++)