diff --git a/incompressible_flow/Inc_Species_Transport/DAspecies3_primitiveVenturi.cfg b/incompressible_flow/Inc_Species_Transport/DAspecies3_primitiveVenturi.cfg
index 306294a..0e1c929 100644
--- a/incompressible_flow/Inc_Species_Transport/DAspecies3_primitiveVenturi.cfg
+++ b/incompressible_flow/Inc_Species_Transport/DAspecies3_primitiveVenturi.cfg
@@ -5,7 +5,7 @@
 % Author: T. Kattmann                                                          %
 % Institution: Bosch Thermotechniek B.V.                                       %
 % Date: 2021/10/14                                                             %
-% File Version 7.2.1 "Blackbird"                                               %
+% File Version 7.5.1 "Blackbird"                                               %
 %                                                                              %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
@@ -14,7 +14,12 @@
 SOLVER= INC_RANS
 KIND_TURB_MODEL= SST
 %
-OBJECTIVE_FUNCTION= SURFACE_SPECIES_VARIANCE
+CUSTOM_OUTPUTS= 'avg_species_0 : AreaAvg{SPECIES[0]}[outlet];\
+                 avg_species_1 : AreaAvg{SPECIES[1]}[outlet];\
+                 var_species : AreaAvg{pow(SPECIES[0] - avg_species_0, 2) +\
+                                       pow(SPECIES[1] - avg_species_1, 2)}[outlet]'
+CUSTOM_OBJFUNC= 'var_species'
+OBJECTIVE_FUNCTION= CUSTOM_OBJFUNC
 OBJECTIVE_WEIGHT= 1.0
 %
 % ---------------- INCOMPRESSIBLE FLOW CONDITION DEFINITION -------------------%
@@ -80,7 +85,7 @@ LINEAR_SOLVER= FGMRES
 LINEAR_SOLVER_PREC= ILU
 LINEAR_SOLVER_ERROR= 1E-8
 LINEAR_SOLVER_ITER= 20
-
+%
 % -------------------- FLOW NUMERICAL METHOD DEFINITION -----------------------%
 %
 CONV_NUM_METHOD_FLOW= FDS
@@ -119,7 +124,6 @@ CONV_STARTITER= 10
 % ------------------------- INPUT/OUTPUT INFORMATION --------------------------%
 %
 MESH_FILENAME= primitiveVenturi.su2
-%
 SCREEN_OUTPUT= INNER_ITER WALL_TIME RMS_ADJ_PRESSURE RMS_ADJ_VELOCITY-X RMS_ADJ_VELOCITY-Y RMS_ADJ_TKE RMS_ADJ_DISSIPATION RMS_ADJ_SPECIES_0 RMS_ADJ_SPECIES_1
 SCREEN_WRT_FREQ_INNER= 10
 %
@@ -140,3 +144,4 @@ RESTART_FILENAME= restart
 SOLUTION_FILENAME= solution
 %
 WRT_PERFORMANCE= YES
+