diff --git a/Common/src/CConfig.cpp b/Common/src/CConfig.cpp
index c5586098980..7514aff4f7e 100644
--- a/Common/src/CConfig.cpp
+++ b/Common/src/CConfig.cpp
@@ -1161,6 +1161,8 @@ void CConfig::SetConfig_Options() {
   addDoubleOption("GAS_CONSTANT", Gas_Constant, 287.058);
   /*!\brief GAMMA_VALUE  \n DESCRIPTION: Ratio of specific heats (1.4 (air), only for compressible flows) \ingroup Config*/
   addDoubleOption("GAMMA_VALUE", Gamma, 1.4);
+  /*!\brief THERMODYNAMIC_PRESSURE  \n DESCRIPTION: Thermodynamics(operating) Pressure (101325 Pa), only for incompressible flows) \ingroup Config*/
+  addDoubleOption("THERMODYNAMIC_PRESSURE", Pressure_Thermodynamic, 101325.0);
   /*!\brief CP_VALUE  \n DESCRIPTION: Specific heat at constant pressure, Cp (1004.703 J/kg*K (air), constant density incompressible fluids only) \ingroup Config*/
   addDoubleListOption("SPECIFIC_HEAT_CP", nSpecific_Heat_Cp, Specific_Heat_Cp);
   /*!\brief THERMAL_EXPANSION_COEFF  \n DESCRIPTION: Thermal expansion coefficient (0.00347 K^-1 (air), used for Boussinesq approximation for liquids/non-ideal gases) \ingroup Config*/
diff --git a/SU2_CFD/src/solvers/CIncEulerSolver.cpp b/SU2_CFD/src/solvers/CIncEulerSolver.cpp
index e7f238e7334..a85c66fa11b 100644
--- a/SU2_CFD/src/solvers/CIncEulerSolver.cpp
+++ b/SU2_CFD/src/solvers/CIncEulerSolver.cpp
@@ -328,10 +328,9 @@ void CIncEulerSolver::SetNondimensionalization(CConfig *config, unsigned short i
     case FLUID_MIXTURE:
 
       config->SetGas_Constant(UNIVERSAL_GAS_CONSTANT / (config->GetMolecular_Weight() / 1000.0));
-      Pressure_Thermodynamic = Density_FreeStream * Temperature_FreeStream * config->GetGas_Constant();
+      Pressure_Thermodynamic = config->GetPressure_Thermodynamic();
       auxFluidModel = new CFluidScalar(config->GetSpecific_Heat_Cp(), config->GetGas_Constant(), Pressure_Thermodynamic, config);
       auxFluidModel->SetTDState_T(Temperature_FreeStream, config->GetSpecies_Init());
-      config->SetPressure_Thermodynamic(Pressure_Thermodynamic);
       break;
 
     default:
diff --git a/TestCases/parallel_regression.py b/TestCases/parallel_regression.py
index 06443d2f8db..af826b4608b 100644
--- a/TestCases/parallel_regression.py
+++ b/TestCases/parallel_regression.py
@@ -1338,7 +1338,7 @@ def main():
     species2_primitiveVenturi_mixingmodel.cfg_dir   = "species_transport/venturi_primitive_3species"
     species2_primitiveVenturi_mixingmodel.cfg_file  = "species2_primitiveVenturi_mixingmodel.cfg"
     species2_primitiveVenturi_mixingmodel.test_iter = 50
-    species2_primitiveVenturi_mixingmodel.test_vals = [-5.477173, -4.589710, -4.582462, -5.690334, -0.069005, -5.631182, 5.000000, -1.668297, 5.000000, -4.866834, 5.000000, -1.168385, 0.000425, 0.000404, 0.000021, 0.000000]
+    species2_primitiveVenturi_mixingmodel.test_vals = [-5.477236, -4.589782, -4.582531, -5.690416, -0.068943, -5.631254, 5.000000, -1.668303, 5.000000, -4.866978, 5.000000, -1.168368, 0.000425, 0.000404, 0.000021, 0.000000]
     species2_primitiveVenturi_mixingmodel.new_output = True
     test_list.append(species2_primitiveVenturi_mixingmodel)
 
@@ -1347,7 +1347,7 @@ def main():
     species2_primitiveVenturi_mixingmodel_boundedscalar.cfg_dir   = "species_transport/venturi_primitive_3species"
     species2_primitiveVenturi_mixingmodel_boundedscalar.cfg_file  = "species2_primitiveVenturi_mixingmodel_boundedscalar.cfg"
     species2_primitiveVenturi_mixingmodel_boundedscalar.test_iter = 50
-    species2_primitiveVenturi_mixingmodel_boundedscalar.test_vals = [-5.419758, -4.490843, -4.496264, -5.724852, -0.120393, -5.693152, 5.000000, -1.766881, 5.000000, -4.958352, 5.000000, -2.150266, 0.000300, 0.000300, 0.000000, 0.000000]
+    species2_primitiveVenturi_mixingmodel_boundedscalar.test_vals = [-5.419823, -4.490921, -4.496340, -5.724950, -0.120331, -5.693224, 5.000000, -1.766882, 5.000000, -4.958487, 5.000000, -2.150247, 0.000300, 0.000300, 0.000000, 0.000000]
     species2_primitiveVenturi_mixingmodel_boundedscalar.new_output = True
     test_list.append(species2_primitiveVenturi_mixingmodel_boundedscalar)
 
@@ -1356,7 +1356,7 @@ def main():
     species2_primitiveVenturi_mixingmodel_viscosity.cfg_dir   = "species_transport/venturi_primitive_3species"
     species2_primitiveVenturi_mixingmodel_viscosity.cfg_file  = "species2_primitiveVenturi_mixingmodel_viscosity.cfg"
     species2_primitiveVenturi_mixingmodel_viscosity.test_iter = 50
-    species2_primitiveVenturi_mixingmodel_viscosity.test_vals = [-4.415103, -4.019010, -4.341952, -5.471507, 0.437029, -4.685683, 5.000000, -1.814481, 5.000000, -5.282862, 5.000000, -1.717346, 2.280789, 0.971585, 0.607256, 0.701947]
+    species2_primitiveVenturi_mixingmodel_viscosity.test_vals = [-4.738778, -4.325766, -4.610914, -5.834431, 0.521730, -4.934375, 5.000000, -1.887191, 5.000000, -5.499917, 5.000000, -1.770845, 2.292904, 0.971941, 0.608500, 0.712464]
     species2_primitiveVenturi_mixingmodel_viscosity.new_output = True
     test_list.append(species2_primitiveVenturi_mixingmodel_viscosity)
     
@@ -1365,7 +1365,7 @@ def main():
     species2_primitiveVenturi_mixingmodel_heatcapacity_H2.cfg_dir   = "species_transport/venturi_primitive_3species"
     species2_primitiveVenturi_mixingmodel_heatcapacity_H2.cfg_file  = "species2_primitiveVenturi_mixingmodel_heatcapacity_H2.cfg"
     species2_primitiveVenturi_mixingmodel_heatcapacity_H2.test_iter = 50
-    species2_primitiveVenturi_mixingmodel_heatcapacity_H2.test_vals = [-6.119300, -4.997334, -4.886952, -7.382047, 2.439615, -5.627780, 30.000000, -5.723010, 12.000000, -8.145296, 9.000000, -8.075817, 2.084563, 1.000000, 0.600000, 0.484563]
+    species2_primitiveVenturi_mixingmodel_heatcapacity_H2.test_vals = [-6.105905, -4.979417, -4.870704, -7.338344, 2.435662, -5.621107, 30.000000, -5.737172, 12.000000, -8.148164, 9.000000, -8.040415, 2.084589, 1.000000, 0.600000, 0.484589]
     species2_primitiveVenturi_mixingmodel_heatcapacity_H2.su2_exec  = "mpirun -n 2 SU2_CFD"
     species2_primitiveVenturi_mixingmodel_heatcapacity_H2.timeout   = 1600
     species2_primitiveVenturi_mixingmodel_heatcapacity_H2.new_output = True
@@ -1377,7 +1377,7 @@ def main():
     species2_primitiveVenturi_mixingmodel_heatcapacity_H2_ND.cfg_dir   = "species_transport/venturi_primitive_3species"
     species2_primitiveVenturi_mixingmodel_heatcapacity_H2_ND.cfg_file  = "species2_primitiveVenturi_mixingmodel_heatcapacity_H2_ND.cfg"
     species2_primitiveVenturi_mixingmodel_heatcapacity_H2_ND.test_iter = 50
-    species2_primitiveVenturi_mixingmodel_heatcapacity_H2_ND.test_vals = [-5.725157, -5.302154, -5.191782, -8.385791, 2.134792, -5.233618, 30.000000, -5.722966, 12.000000, -8.145150, 9.000000, -8.075867, 2.084565, 1.000000, 0.600000, 0.484565]
+    species2_primitiveVenturi_mixingmodel_heatcapacity_H2_ND.test_vals = [-5.711760, -5.284237, -5.175532, -8.342082, 2.130839, -5.226944, 30.000000, -5.737157, 12.000000, -8.148020, 9.000000, -8.040460, 2.084591, 1.000000, 0.600000, 0.484591]
     species2_primitiveVenturi_mixingmodel_heatcapacity_H2_ND.su2_exec  = "mpirun -n 2 SU2_CFD"
     species2_primitiveVenturi_mixingmodel_heatcapacity_H2_ND.timeout   = 1600
     species2_primitiveVenturi_mixingmodel_heatcapacity_H2_ND.new_output = True
@@ -1427,7 +1427,7 @@ def main():
     species3_multizone_restart.cfg_dir   = "species_transport/multizone"
     species3_multizone_restart.cfg_file  = "configMaster.cfg"
     species3_multizone_restart.test_iter = 5
-    species3_multizone_restart.test_vals = [-4.773393, -4.254100]
+    species3_multizone_restart.test_vals = [-7.169637, -6.381576]
     species3_multizone_restart.new_output = True
     species3_multizone_restart.multizone = True
     test_list.append(species3_multizone_restart)
diff --git a/TestCases/species_transport/venturi_primitive_3species/species2_primitiveVenturi_mixingmodel.cfg b/TestCases/species_transport/venturi_primitive_3species/species2_primitiveVenturi_mixingmodel.cfg
index 5d4595e1a14..53f2764f995 100644
--- a/TestCases/species_transport/venturi_primitive_3species/species2_primitiveVenturi_mixingmodel.cfg
+++ b/TestCases/species_transport/venturi_primitive_3species/species2_primitiveVenturi_mixingmodel.cfg
@@ -32,6 +32,8 @@ INC_NONDIM= DIMENSIONAL
 %
 FLUID_MODEL= FLUID_MIXTURE
 %
+THERMODYNAMIC_PRESSURE= 101325.0 
+%
 MOLECULAR_WEIGHT= 28.96, 16.043
 %
 SPECIFIC_HEAT_CP = 1009.39, 1009.39
diff --git a/TestCases/species_transport/venturi_primitive_3species/species2_primitiveVenturi_mixingmodel_boundedscalar.cfg b/TestCases/species_transport/venturi_primitive_3species/species2_primitiveVenturi_mixingmodel_boundedscalar.cfg
index 4c668a8ca0a..f51545a1174 100644
--- a/TestCases/species_transport/venturi_primitive_3species/species2_primitiveVenturi_mixingmodel_boundedscalar.cfg
+++ b/TestCases/species_transport/venturi_primitive_3species/species2_primitiveVenturi_mixingmodel_boundedscalar.cfg
@@ -32,6 +32,8 @@ INC_NONDIM= DIMENSIONAL
 %
 FLUID_MODEL= FLUID_MIXTURE
 %
+THERMODYNAMIC_PRESSURE= 101325.0 
+%
 MOLECULAR_WEIGHT= 28.96, 16.043
 %
 SPECIFIC_HEAT_CP = 1009.39, 1009.39
diff --git a/TestCases/species_transport/venturi_primitive_3species/species2_primitiveVenturi_mixingmodel_heatcapacity_H2.cfg b/TestCases/species_transport/venturi_primitive_3species/species2_primitiveVenturi_mixingmodel_heatcapacity_H2.cfg
index 0fce29f4142..24b943f677b 100644
--- a/TestCases/species_transport/venturi_primitive_3species/species2_primitiveVenturi_mixingmodel_heatcapacity_H2.cfg
+++ b/TestCases/species_transport/venturi_primitive_3species/species2_primitiveVenturi_mixingmodel_heatcapacity_H2.cfg
@@ -33,6 +33,8 @@ INC_NONDIM= DIMENSIONAL
 %
 FLUID_MODEL= FLUID_MIXTURE
 %
+THERMODYNAMIC_PRESSURE= 101325.0 
+%
 MOLECULAR_WEIGHT= 2.01588, 28.960
 %
 SPECIFIC_HEAT_CP = 14310, 1009.39
diff --git a/TestCases/species_transport/venturi_primitive_3species/species2_primitiveVenturi_mixingmodel_heatcapacity_H2_ND.cfg b/TestCases/species_transport/venturi_primitive_3species/species2_primitiveVenturi_mixingmodel_heatcapacity_H2_ND.cfg
index 6af9b3ed7c9..0f53f027374 100644
--- a/TestCases/species_transport/venturi_primitive_3species/species2_primitiveVenturi_mixingmodel_heatcapacity_H2_ND.cfg
+++ b/TestCases/species_transport/venturi_primitive_3species/species2_primitiveVenturi_mixingmodel_heatcapacity_H2_ND.cfg
@@ -34,6 +34,8 @@ INC_NONDIM= INITIAL_VALUES
 %
 FLUID_MODEL= FLUID_MIXTURE
 %
+THERMODYNAMIC_PRESSURE= 101325.0 
+%
 MOLECULAR_WEIGHT= 2.01588, 28.960
 %
 SPECIFIC_HEAT_CP = 14310, 1009.39
diff --git a/TestCases/species_transport/venturi_primitive_3species/species2_primitiveVenturi_mixingmodel_viscosity.cfg b/TestCases/species_transport/venturi_primitive_3species/species2_primitiveVenturi_mixingmodel_viscosity.cfg
index adc7050dfb6..e92a8c9088c 100644
--- a/TestCases/species_transport/venturi_primitive_3species/species2_primitiveVenturi_mixingmodel_viscosity.cfg
+++ b/TestCases/species_transport/venturi_primitive_3species/species2_primitiveVenturi_mixingmodel_viscosity.cfg
@@ -32,6 +32,8 @@ INC_NONDIM= DIMENSIONAL
 %
 FLUID_MODEL= FLUID_MIXTURE
 %
+THERMODYNAMIC_PRESSURE= 101325.0 
+%
 MOLECULAR_WEIGHT= 16.043, 28.960
 %
 SPECIFIC_HEAT_CP = 2224.43, 1009.39
diff --git a/config_template.cfg b/config_template.cfg
index 5b76a40e403..9b676406417 100644
--- a/config_template.cfg
+++ b/config_template.cfg
@@ -337,6 +337,9 @@ CRITICAL_PRESSURE= 3588550.0
 % Acentri factor (0.035 (air))
 ACENTRIC_FACTOR= 0.035
 %
+% Thermodynamics(operating) Pressure (101325 Pa default value, only for incompressible flow and FLUID_MIXTURE)
+THERMODYNAMIC_PRESSURE= 101325.0 
+%
 % Specific heat at constant pressure, Cp (1004.703 J/kg*K (air)).
 % Incompressible fluids with energy eqn. (CONSTANT_DENSITY, INC_IDEAL_GAS) and the heat equation.
 SPECIFIC_HEAT_CP= 1004.703