Fix sign error in incompressible Spalding wall function (#2541)

* Fix sign error in Spalding composite term

* Update SU2_CFD/src/solvers/CIncNSSolver.cpp

Co-authored-by: Nijso <nijso@hotmail.com>

* Update inc_turb_wallfunction_flatpate_xxx.test_vals

* Update sudo_tutorial.test_vals

---------

Co-authored-by: Nijso <bigfootedrockmidget@hotmail.com>
Co-authored-by: Nijso <nijso@hotmail.com>

Author: dunapkt

SU2_CFD/src/solvers/CIncNSSolver.cpp

@@ -739,7 +739,7 @@ void CIncNSSolver::SetTau_Wall_WF(CGeometry *geometry, CSolver **solver_containe
 
         /*--- Spalding's universal form for the BL velocity with the
          *    outer velocity form of White & Christoph above. ---*/
-        Y_Plus = U_Plus + Y_Plus_White + (exp(-kappa * B)* (1.0 - kUp - 0.5 * kUp * kUp - kUp * kUp * kUp / 6.0));
+        Y_Plus = U_Plus + Y_Plus_White - (exp(-kappa * B)* (1.0 + kUp + 0.5 * kUp * kUp + kUp * kUp * kUp / 6.0));
 
         /*--- incompressible formulation ---*/
         Eddy_Visc_Wall = Lam_Visc_Wall * kappa*exp(-kappa*B) * (exp(kUp) -1.0 - kUp - kUp * kUp / 2.0);

TestCases/serial_regression.py

@@ -457,15 +457,15 @@ def main():
     inc_turb_wallfunction_flatplate_sst.cfg_dir   = "wallfunctions/flatplate/incompressible_SST"
     inc_turb_wallfunction_flatplate_sst.cfg_file  = "turb_SST_flatplate.cfg"
     inc_turb_wallfunction_flatplate_sst.test_iter = 10
-    inc_turb_wallfunction_flatplate_sst.test_vals = [-6.881306, -5.729111, -6.724803, -4.242636, -7.162846, -2.044959, 10.000000, -2.877924, 0.001151, 0.003161, 0.000000]
+    inc_turb_wallfunction_flatplate_sst.test_vals = [ -6.881321, -5.729177, -6.724837, -4.242636, -7.162893, -2.044945, 10.000000, -2.877955, 0.001151, 0.003161, 0.000000]
     test_list.append(inc_turb_wallfunction_flatplate_sst)
 
     # FLAT PLATE, WALL FUNCTIONS, INCOMPRESSIBLE SA
     inc_turb_wallfunction_flatplate_sa           = TestCase('inc_turb_sa_wallfunction_flatplate')
     inc_turb_wallfunction_flatplate_sa.cfg_dir   = "wallfunctions/flatplate/incompressible_SA"
     inc_turb_wallfunction_flatplate_sa.cfg_file  = "turb_SA_flatplate.cfg"
     inc_turb_wallfunction_flatplate_sa.test_iter = 10
-    inc_turb_wallfunction_flatplate_sa.test_vals = [-6.894206, -5.715970, -6.743740, -4.242551, -9.550272, 10.000000, -2.879370, 0.001021, 0.003759]
+    inc_turb_wallfunction_flatplate_sa.test_vals = [-6.894226, -5.716031, -6.743814, -4.242551, -9.550079, 10.000000, -2.879412, 0.001021, 0.003759]
     test_list.append(inc_turb_wallfunction_flatplate_sa)
 
     ####################

TestCases/tutorials.py

@@ -96,7 +96,7 @@ def main():
     sudo_tutorial.cfg_dir = "../Tutorials/incompressible_flow/Inc_Turbulent_Bend_Wallfunctions"
     sudo_tutorial.cfg_file = "sudo.cfg"
     sudo_tutorial.test_iter = 10
-    sudo_tutorial.test_vals = [-14.664419, -12.789769, -13.280336, -13.016392, -13.018817, -9.510066, 15.000000, -1.994192]
+    sudo_tutorial.test_vals = [-10.243992, -8.397140, -8.812974, -8.525505, -8.731439, -5.183918, 15.000000, -1.941343]
     sudo_tutorial.command = TestCase.Command("mpirun -n 2", "SU2_CFD")
     test_list.append(sudo_tutorial)