diff --git a/solvers/DPStokes/mobility.h b/solvers/DPStokes/mobility.h
index ca42c27..a65e115 100644
--- a/solvers/DPStokes/mobility.h
+++ b/solvers/DPStokes/mobility.h
@@ -50,6 +50,15 @@ class DPStokes: public libmobility::Mobility{
     this->temperature = ipar.temperature;
     this->lanczosTolerance = ipar.tolerance;
     this->dppar.mode = this->wallmode;
+    this->dppar.hydrodynamicRadius = ipar.hydrodynamicRadius; //a
+    this->dppar.w = 6;
+    this->dppar.beta = 1.714*this->dppar.w;
+    this->dppar.alpha = this->dppar.w/2.0;
+    real h = this->dppar.hydrodynamicRadius/1.554;
+    this->dppar.nx = this->dppar.Lx/h;
+    this->dppar.ny = this->dppar.Ly/h;
+    real Lz = this->dppar.zmax - this->dppar.zmin;
+    this->dppar.nz = M_PI*Lz/h;
     dpstokes->initialize(dppar, this->numberParticles);
     Mobility::initialize(ipar);
   }
diff --git a/solvers/DPStokes/python_wrapper.cpp b/solvers/DPStokes/python_wrapper.cpp
index 3ca90a0..8762248 100644
--- a/solvers/DPStokes/python_wrapper.cpp
+++ b/solvers/DPStokes/python_wrapper.cpp
@@ -31,12 +31,6 @@ MOBILITY_PYTHONIFY_WITH_EXTRA_CODE(DPStokes,
                                          params.Ly = Ly;
                                          params.zmin = zmin;
                                          params.zmax = zmax;
-                                         params.w = 6;
-                                         //	  params.w_d = w_d;
-                                         params.beta = 1.714*params.w;
-                                         // params.beta_d = beta_d;
-                                         params.alpha = params.w/2.0;
-                                         // params.alpha_d = alpha_d;
                                          self.setParametersDPStokes(params);
                                        },
                                        "dt"_a, "Lx"_a, "Ly"_a, "zmin"_a,