feat(linear-static-mitc4-shell): step 0 - shell-semantic-model

include/fesa/model/domain.hpp

@@ -17,8 +17,11 @@ public:
 
     const std::vector<Node>& nodes() const noexcept;
     const std::vector<EulerBeam3DDefinition>& elements() const noexcept;
+    const std::vector<Mitc4ShellDefinition>& shellElements() const noexcept;
     const std::vector<LinearElasticMaterial>& materials() const noexcept;
     const std::vector<GeneralBeamSection>& sections() const noexcept;
+    const std::vector<ShellSection>& shellSections() const noexcept;
+    const std::vector<ShellNodeInitialFrame>& shellNodeInitialFrames() const noexcept;
     const std::vector<NodeSet>& nodeSets() const noexcept;
     const std::vector<ElementSet>& elementSets() const noexcept;
     const std::vector<StaticStepDefinition>& steps() const noexcept;

include/fesa/model/model_types.hpp

@@ -8,6 +8,7 @@
 #include <filesystem>
 #include <optional>
 #include <string>
+#include <string_view>
 #include <vector>
 
 namespace fesa {
@@ -40,6 +41,36 @@ struct GeneralBeamSection {
     SourceLocation location;
 };
 
+enum class ShellSourceElementType {
+    s4,
+    s4r
+};
+
+inline constexpr std::string_view kMitc4InternalFormulation{"FESA-MITC4"};
+
+struct ShellSection {
+    std::string name;
+    double thickness;
+    EntityIndex materialIndex;
+    SourceLocation location;
+};
+
+struct Mitc4ShellDefinition {
+    SourceEntityId sourceId;
+    ShellSourceElementType sourceType;
+    std::array<EntityIndex, 4> nodeIndices;
+    EntityIndex materialIndex;
+    EntityIndex sectionIndex;
+    SourceLocation location;
+};
+
+struct ShellNodeInitialFrame {
+    EntityIndex nodeIndex;
+    std::array<double, 3> director;
+    std::array<double, 3> tangentA;
+    std::array<double, 3> tangentB;
+};
+
 struct EulerBeam3DDefinition {
     SourceEntityId sourceId;
     std::array<EntityIndex, 2> nodeIndices;
@@ -118,8 +149,11 @@ struct ModelDefinition {
     std::string heading;
     std::vector<Node> nodes;
     std::vector<EulerBeam3DDefinition> elements;
+    std::vector<Mitc4ShellDefinition> shellElements;
     std::vector<LinearElasticMaterial> materials;
     std::vector<GeneralBeamSection> sections;
+    std::vector<ShellSection> shellSections;
+    std::vector<ShellNodeInitialFrame> shellNodeInitialFrames;
     std::vector<NodeSet> nodeSets;
     std::vector<ElementSet> elementSets;
     std::vector<PartDefinition> parts;