Changeset 16882

Timestamp:

11/22/13 07:28:18 (11 years ago)

Author:

Mathieu Morlighem

Message:

NEW: done with friction

Location:

issm/trunk-jpl/src/c/analyses

Files:

• StressbalanceAnalysis.cpp (modified) (5 diffs)
• StressbalanceAnalysis.h (modified) (3 diffs)

issm/trunk-jpl/src/c/analyses/StressbalanceAnalysis.cpp

@@ -980 +980 @@
 
         /*Intermediaries*/
-        bool       mainlyfloating;
+        bool        mainlyfloating;
         int         migration_style,point1;
         IssmDouble  alpha2,Jdet,fraction1,fraction2;
@@ -1755 +1755 @@
         if(element->IsFloating() || !element->IsOnBed()) return NULL;
 
-        return NULL;
+        /*Intermediaries*/
+        bool        mainlyfloating;
+        int         migration_style,point1;
+        IssmDouble  alpha2,Jdet,fraction1,fraction2;
+        IssmDouble  gllevelset,phi=1.;
+        IssmDouble *xyz_list_base = NULL;
+        Gauss*      gauss         = NULL;
+
+        /*Fetch number of nodes and dof for this finite element*/
+        int numnodes = element->GetNumberOfNodes();
+        int numdof   = numnodes*2;
+
+        /*Initialize Element matrix and vectors*/
+        ElementMatrix* Ke      = element->NewElementMatrix(HOApproximationEnum);
+        IssmDouble*    B       = xNew<IssmDouble>(2*numdof);
+        IssmDouble     D[2][2] = {0.};
+
+        /*Retrieve all inputs and parameters*/
+        element->GetVerticesCoordinatesBase(&xyz_list_base);
+        element->FindParam(&migration_style,GroundinglineMigrationEnum);
+        Input* vx_input         = element->GetInput(VxEnum);      _assert_(vx_input);
+        Input* vy_input         = element->GetInput(VyEnum);      _assert_(vy_input);
+        Input* vz_input         = element->GetInput(VzEnum);      _assert_(vz_input);
+        Input* gllevelset_input = NULL;
+
+        /*build friction object, used later on: */
+        Friction* friction=new Friction(element,2);
+
+        /*Recover portion of element that is grounded*/
+        if(migration_style==SubelementMigrationEnum) phi=element->GetGroundedPortion(xyz_list_base);
+        if(migration_style==SubelementMigration2Enum){
+                gllevelset_input=element->GetInput(MaskGroundediceLevelsetEnum); _assert_(gllevelset_input);
+                element->GetGroundedPart(&point1,&fraction1,&fraction2,&mainlyfloating);
+                //gauss = element->NewGauss(point1,fraction1,fraction2,mainlyfloating,2);
+                gauss=element->NewGaussBase(2);
+        }
+        else{
+                gauss=element->NewGaussBase(2);
+        }
+
+        /* Start  looping on the number of gaussian points: */
+        for(int ig=gauss->begin();ig<gauss->end();ig++){
+                gauss->GaussPoint(ig);
+
+                friction->GetAlpha2(&alpha2,gauss,vx_input,vy_input,vz_input);
+                if(migration_style==SubelementMigrationEnum) alpha2=phi*alpha2;
+                if(migration_style==SubelementMigration2Enum){
+                        gllevelset_input->GetInputValue(&gllevelset, gauss);
+                        if(gllevelset<0.) alpha2=0.;
+                }
+
+                this->GetBHOFriction(B,element,xyz_list_base,gauss);
+                element->JacobianDeterminantBase(&Jdet,xyz_list_base,gauss);
+                for(int i=0;i<2;i++) D[i][i]=alpha2*gauss->weight*Jdet;
+
+                TripleMultiply(B,2,numdof,1,
+                                        &D[0][0],2,2,0,
+                                        B,2,numdof,0,
+                                        &Ke->values[0],1);
+        }
+
+        /*Transform Coordinate System*/
+        element->TransformStiffnessMatrixCoord(Ke,XYEnum);
+
+        /*Clean up and return*/
+        delete gauss;
+        delete friction;
+        xDelete<IssmDouble>(xyz_list_base);
+        xDelete<IssmDouble>(B);
+        return Ke;
 }/*}}}*/
 ElementVector* StressbalanceAnalysis::CreatePVectorHO(Element* element){/*{{{*/
@@ -1950 +2019 @@
         xDelete<IssmDouble>(dbasis);
 }/*}}}*/
+void StressbalanceAnalysis::GetBHOFriction(IssmDouble* B,Element* element,IssmDouble* xyz_list,Gauss* gauss){/*{{{*/
+        /*Compute B  matrix. B=[B1 B2 B3] where Bi is square and of size 2. 
+         * For node i, Bi can be expressed in the actual coordinate system
+         * by: 
+         *                 Bi=[ N   0 ]
+         *                    [ 0   N ]
+         * where N is the finiteelement function for node i.
+         *
+         * We assume B has been allocated already, of size: 2 x (numdof*numnodes)
+         */
+
+        /*Fetch number of nodes for this finite element*/
+        int numnodes = element->GetNumberOfNodes();
+
+        /*Get nodal functions derivatives*/
+        IssmDouble* basis=xNew<IssmDouble>(numnodes);
+        element->NodalFunctions(basis,gauss);
+
+        /*Build L: */
+        for(int i=0;i<numnodes;i++){
+                B[2*numnodes*0+2*i+0] = basis[i];
+                B[2*numnodes*0+2*i+1] = 0.;
+                B[2*numnodes*1+2*i+0] = 0.;
+                B[2*numnodes*1+2*i+1] = basis[i];
+        }
+
+        /*Clean-up*/
+        xDelete<IssmDouble>(basis);
+}/*}}}*/
 void StressbalanceAnalysis::InputUpdateFromSolutionHO(IssmDouble* solution,Element* element){/*{{{*/
 
@@ -2108 +2206 @@
 }/*}}}*/
 ElementMatrix* StressbalanceAnalysis::CreateKMatrixFSFriction(Element* element){/*{{{*/
-        return NULL;
+
+        if(element->IsFloating() || !element->IsOnBed()) return NULL;
+
+        /*If on water or not FS, skip stiffness: */
+        int approximation;
+        element->GetInputValue(&approximation,ApproximationEnum);
+        if(approximation!=FSApproximationEnum && approximation!=SSAFSApproximationEnum && approximation!=HOFSApproximationEnum) return NULL;
+
+        /*Intermediaries*/
+        bool        mainlyfloating;
+        int         i,meshtype,dim,epssize;
+        int         migration_style,point1;
+        IssmDouble  alpha2,Jdet,fraction1,fraction2;
+        IssmDouble  gllevelset,phi=1.;
+        IssmDouble *xyz_list_base = NULL;
+        Gauss*      gauss         = NULL;
+
+        /*Get problem dimension*/
+        element->FindParam(&meshtype,MeshTypeEnum);
+        switch(meshtype){
+                case Mesh2DverticalEnum: dim = 2;break;
+                case Mesh3DEnum:         dim = 3;break;
+                default: _error_("mesh "<<EnumToStringx(meshtype)<<" not supported yet");
+        }
+
+        /*Fetch number of nodes and dof for this finite element*/
+        int vnumnodes = element->GetNumberOfNodesVelocity();
+        int pnumnodes = element->GetNumberOfNodesPressure();
+        int numdof    = vnumnodes*dim + pnumnodes;
+
+        /*Initialize Element matrix and vectors*/
+        ElementMatrix* Ke      = element->NewElementMatrix(FSvelocityEnum);
+        IssmDouble*    B       = xNew<IssmDouble>((dim-1)*numdof);
+        IssmDouble*    D       = xNewZeroInit<IssmDouble>((dim-1)*(dim-1));
+
+        /*Retrieve all inputs and parameters*/
+        element->GetVerticesCoordinatesBase(&xyz_list_base);
+        element->FindParam(&migration_style,GroundinglineMigrationEnum);
+        Input* vx_input         = element->GetInput(VxEnum);      _assert_(vx_input);
+        Input* vy_input         = element->GetInput(VyEnum);      _assert_(vy_input);
+        Input* vz_input         = NULL;
+        if(dim==3){    vz_input = element->GetInput(VzEnum);      _assert_(vz_input);}
+        Input* gllevelset_input = NULL;
+
+        /*build friction object, used later on: */
+        Friction* friction=new Friction(element,dim==3?3:1);
+
+        /*Recover portion of element that is grounded*/
+        if(migration_style==SubelementMigrationEnum) phi=element->GetGroundedPortion(xyz_list_base);
+        if(migration_style==SubelementMigration2Enum){
+                gllevelset_input=element->GetInput(MaskGroundediceLevelsetEnum); _assert_(gllevelset_input);
+                element->GetGroundedPart(&point1,&fraction1,&fraction2,&mainlyfloating);
+                //gauss = element->NewGauss(point1,fraction1,fraction2,mainlyfloating,2);
+                gauss=element->NewGaussBase(3);
+        }
+        else{
+                gauss=element->NewGaussBase(3);
+        }
+
+        /* Start  looping on the number of gaussian points: */
+        for(int ig=gauss->begin();ig<gauss->end();ig++){
+                gauss->GaussPoint(ig);
+
+                friction->GetAlpha2(&alpha2,gauss,vx_input,vy_input,vz_input);
+                if(migration_style==SubelementMigrationEnum) alpha2=phi*alpha2;
+                if(migration_style==SubelementMigration2Enum){
+                        gllevelset_input->GetInputValue(&gllevelset, gauss);
+                        if(gllevelset<0.) alpha2=0.;
+                }
+
+                this->GetBFSFriction(B,element,dim,xyz_list_base,gauss);
+                element->JacobianDeterminantBase(&Jdet,xyz_list_base,gauss);
+                for(int i=0;i<2;i++) D[i*(dim-1)+i] = alpha2*gauss->weight*Jdet; //taub_x = -alpha2 v_x (same for y)
+
+                TripleMultiply(B,dim-1,numdof,1,
+                                        D,dim-1,dim-1,0,
+                                        B,dim-1,numdof,0,
+                                        &Ke->values[0],1);
+        }
+
+        /*DO NOT Transform Coordinate System: this stiffness matrix is already expressed in tangential coordinates*/
+
+        /*Clean up and return*/
+        delete gauss;
+        delete friction;
+        xDelete<IssmDouble>(xyz_list_base);
+        xDelete<IssmDouble>(B);
+        xDelete<IssmDouble>(D);
+        return Ke;
 }/*}}}*/
 ElementVector* StressbalanceAnalysis::CreatePVectorFS(Element* element){/*{{{*/
@@ -2575 +2761 @@
         xDelete<IssmDouble>(pbasis);
 }/*}}}*/
+void StressbalanceAnalysis::GetBFSFriction(IssmDouble* B,Element* element,int dim,IssmDouble* xyz_list,Gauss* gauss){/*{{{*/
+        /* Compute L  matrix. L=[L1 L2 L3] where Li is square and of size numdof. 
+         * For node i, Li can be expressed in the actual coordinate system
+         * by in 3d 
+         *       Li=[ h 0 0 0 ]
+         *                    [ 0 h 0 0 ]
+         *      in 2d:
+         *       Li=[ h 0 0 ]
+         * where h is the interpolation function for node i.
+         */
+
+        /*Fetch number of nodes for this finite element*/
+        int pnumnodes = element->GetNumberOfNodesPressure();
+        int vnumnodes = element->GetNumberOfNodesVelocity();
+        int pnumdof   = pnumnodes;
+        int vnumdof   = vnumnodes*dim;
+
+        /*Get nodal functions derivatives*/
+        IssmDouble* vbasis=xNew<IssmDouble>(vnumnodes);
+        element->NodalFunctionsVelocity(vbasis,gauss);
+
+        /*Build B: */
+        if(dim==3){
+                for(int i=0;i<vnumnodes;i++){
+                        B[(vnumdof+pnumdof)*0+3*i+0] = vbasis[i];
+                        B[(vnumdof+pnumdof)*0+3*i+1] = 0.;
+                        B[(vnumdof+pnumdof)*0+3*i+2] = 0.;
+
+                        B[(vnumdof+pnumdof)*1+3*i+0] = 0.;
+                        B[(vnumdof+pnumdof)*1+3*i+1] = vbasis[i];
+                        B[(vnumdof+pnumdof)*1+3*i+2] = 0.;
+                }
+                for(int i=0;i<pnumnodes;i++){
+                        B[(vnumdof+pnumdof)*0+i+vnumdof+0] = 0.;
+                        B[(vnumdof+pnumdof)*1+i+vnumdof+0] = 0.;
+                }
+        }
+        else{
+                for(int i=0;i<vnumnodes;i++){
+                        B[2*i+0] = vbasis[i];
+                        B[2*i+1] = 0.;
+                }
+
+                for(int i=0;i<pnumnodes;i++){
+                        B[i+vnumdof+0] = 0.;
+                }
+        }
+
+        /*Clean-up*/
+        xDelete<IssmDouble>(vbasis);
+}/*}}}*/
 void StressbalanceAnalysis::GetSolutionFromInputsFS(Vector<IssmDouble>* solution,Element* element){/*{{{*/
 

issm/trunk-jpl/src/c/analyses/StressbalanceAnalysis.h

@@ -35 +35 @@
                 ElementVector* CreatePVectorSSAFront(Element* element);
                 void GetBSSA(IssmDouble* B,Element* element,IssmDouble* xyz_list,Gauss* gauss);
+                void GetBSSAprime(IssmDouble* B,Element* element,IssmDouble* xyz_list,Gauss* gauss);
                 void GetBSSAFriction(IssmDouble* B,Element* element,IssmDouble* xyz_list,Gauss* gauss);
-                void GetBSSAprime(IssmDouble* B,Element* element,IssmDouble* xyz_list,Gauss* gauss);
                 void InputUpdateFromSolutionSSA(IssmDouble* solution,Element* element);
                 /*L1L2*/
@@ -52 +52 @@
                 void GetBHO(IssmDouble* B,Element* element,IssmDouble* xyz_list,Gauss* gauss);
                 void GetBHOprime(IssmDouble* B,Element* element,IssmDouble* xyz_list,Gauss* gauss);
+                void GetBHOFriction(IssmDouble* B,Element* element,IssmDouble* xyz_list,Gauss* gauss);
                 void InputUpdateFromSolutionHO(IssmDouble* solution,Element* element);
                 /*FS*/
@@ -63 +64 @@
                 void GetBFS(IssmDouble* B,Element* element,int dim,IssmDouble* xyz_list,Gauss* gauss);
                 void GetBFSprime(IssmDouble* B,Element* element,int dim,IssmDouble* xyz_list,Gauss* gauss);
+                void GetBFSFriction(IssmDouble* B,Element* element,int dim,IssmDouble* xyz_list,Gauss* gauss);
                 void GetSolutionFromInputsFS(Vector<IssmDouble>* solution,Element* element);
                 void InputUpdateFromSolutionFS(IssmDouble* solution,Element* element);