ATC version 2.0, date: Aug7

git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@10561 f3b2605a-c512-4ea7-a41b-209d697bcdaa

lib/atc/ElectronDragPower.h

@@ -0,0 +1,73 @@
+#ifndef ELECTRON_DRAG_POWER_H
+#define ELECTRON_DRAG_POWER_H
+
+#include <map>
+#include <string>
+
+using std::map;
+using std::string;
+
+#include "Material.h"
+#include "ATC_TypeDefs.h"
+
+namespace ATC {
+
+  /**
+   *  @class  ElectronDragPower 
+   *  @brief  Base class for defining the lattice drag power from electrons
+   */
+
+  class ElectronDragPower
+  {
+    public:
+    ElectronDragPower() {};
+    virtual ~ElectronDragPower() {};
+    /** computes drag power */
+    virtual bool electron_drag_power(const FIELD_MATS &fields,
+                                     const GRAD_FIELD_MATS &gradFields,
+                                           DENS_MAT & flux)
+    {
+      return false;
+    };
+    virtual void electron_drag_velocity_coefficient(const FIELD_MATS &fields,
+                                                          DENS_MAT & dragCoef)
+    {
+      FIELD_MATS::const_iterator t_field = fields.find(TEMPERATURE);
+      dragCoef.reset((t_field->second).nRows(),1); // zero out matrix, resize if necessary
+    };
+  };
+  //-------------------------------------------------------------------
+  
+  /**
+   *  @class  ElectronDragPowerLinear
+   *  @brief  Class for electron drag that linearly depends on the difference between the electron and lattice velocities
+   */  
+  
+  class ElectronDragPowerLinear : public ElectronDragPower
+  {
+    public:
+      ElectronDragPowerLinear(fstream &matfile,
+                              map<string,double> & parameters,
+                              Material * material_);
+      virtual ~ElectronDragPowerLinear() {};
+      virtual bool electron_drag_power(const FIELD_MATS &fields,
+                                       const GRAD_FIELD_MATS &gradFields,
+                                             DENS_MAT & flux);
+      virtual void electron_drag_velocity_coefficient(const FIELD_MATS &fields,
+                                                            DENS_MAT & dragCoef);
+
+  protected:
+
+      double electronDragInvTau_;
+      Material * material_;
+
+      // used to avoid unnecessary resizing
+      DENS_MAT dragCoefWorkspace_;
+      DENS_MAT invEffMassWorkspace_;
+
+  };
+}
+
+#endif 
+
+