Abstract: A system receives a layout representation of a metasurface, the metasurface including a number of scatterers arranged in a spatial order, each scatterer having one of a number of geometries. The system identifies one or more consecutive ones of the scatterers in the spatial order. The system identifies a sequence representing consecutive ones of the geometries, the sequence being associated with one or more consecutive ones of the scatterers in the spatial order. The system associates a two-dimensional coordinate to the sequence, the two-dimensional coordinate corresponding to a position in the metasurface where the sequence starts. The system generates an output layout file including a reference to the sequence and the associated two-dimensional coordinate.

Abstract: A system for simulating operation of a battery pack comprising a plurality of battery modules includes an electrical model configured to simulate electrical behavior of a respective battery module and a thermal model configured to simulate thermal behavior of the respective battery module. The electrical model provides outputs coupled as inputs to the thermal model, and the thermal model provides outputs coupled as inputs to the electrical model. A coolant model is configured to couple with the thermal model, the coolant model to simulate cooling of the respective battery module based on a temperature and a heat transfer coefficient associated with the respective battery module.

Abstract: Data is received that includes a triangular mesh. Thereafter, a curvature aligned cross field is generated on the triangular mesh. The cross field is used to calculate a quad layout. A subdivision surface can be created using the quad layout as a control cage. Later, vertex locations in the control cage are determined to result in the subdivision surface being an approximation of the triangular mesh. The subdivision subsurface (or a portion thereof) can be visualized in a graphical user interface (e.g., as part of a CAD software application, etc.). Related apparatus, systems, techniques and articles are also described.

Abstract: Data characterizing a fastener and a preload condition applied to the fastener are received in a computer system. A model representing a mechanism coupling a first portion and a second portion of the fastener is created. The first portion and the second portion are located respectively at either end of the fastener along a longitudinal axis of the fastener. The first portion and the second portion are axially displaceable along the axis towards each other via the mechanism and rotatably displaceable about the axis relative to each other via the mechanism. The model includes relative axial displacement and/or relative torsional displacement between the first portion and the second portion corresponding to the preload condition. Physical behaviors of the fastener applied with the preload condition is simulated based on the model.

Abstract: Computationally efficient and accurate methods of fitting black box simulation data to obtain Linear Parametrically Varying models useful for design of thermal management systems are disclosed. The Linear Parametrically Varying models may be used in dynamic simulations to determine temperatures in thermal systems. A computer-implemented model is run at a plurality of fixed values of the scheduling parameter to obtain output responses to excitations of the input at the fixed values of the scheduling parameter. LTI representations are fit to the output responses, the LTI representations having state-space variables characterized by negative real poles. Coefficient matrices of the LTI representations are updated, and an LPV-ROM representation is generated.

Abstract: A computer-implemented method for rich logging of simulation results is disclosed. The method includes running a simulation of a physical process, generating a log file entry with a contextual attribute about a state of the simulation, storing the log file entry in a database, receiving a query to the database from a client referencing a contextual attribute, generating a message from the database in response to the query, and sending the message to the client. Related apparatus, systems, techniques, methods and articles are also described.

Abstract: Systems and methods are provided for a processor-implemented method for compressing, storing, and transmitting simulation data. The simulation data including a set of floating point data values is received, the simulation data characterizing simulated physical properties of a physical object. A first master data value is identified from the set to cluster one or more data values from the set as a first group of data values based on a comparison between a data value of the set and the first master data value. Compressed simulation data is transmitted, where the compressed simulation data includes a floating point representation of the first master data value and integer representations of other data values of the first group of data values.

Abstract: Techniques are provided for the transfer of data (e.g. electromagnetic losses and temperature for an electro-thermal simulation) between domains (e.g. 2D regions, 3D regions) with dissimilar topologies, e.g. to represent a physical object. Meshes from 2D and 3D regions of respective simulation models involved in the data transfer are projected onto and through one another. For profile preserving (e.g., temperature, convection coefficients, mesh displacements, etc.) and conservative (e.g., force, mass, or thermal energy, etc.) data transfers, shape functions and area/volume fractions are used in mapping weight generation, respectively. These weights are later used to generate field values on the mesh of the target simulation model, using data from the mesh of the source simulation model. Related apparatus, systems, techniques and articles are also described.

Abstract: Systems and methods are provided. A physical measurement of the core loss increase associated with a physical deformation of a material of the device is obtained. A data structure describing a model of the device is accessed. A first edge of the model of the device associated with a physical deformation of the device is identified. A finite element mesh is generated to include a single layer mesh comprising a plurality of mesh elements associated with the first edge of the finite element mesh. A core loss value is assigned to each of the plurality of mesh elements. Each of the core loss values representative of the physical measurement of the core loss increase of the material as a result of the physical deformation of the material. An electromagnetic model is generated by performing a finite element analysis based on the finite element mesh and the single layer mesh.

Abstract: Data characterizing an assembly/structure containing a first stage and a second stage are received in a computer system. The first stage can contain a first cyclic symmetry and the second stage can contain a second cyclic symmetry. The first cyclic symmetry and the second cyclic symmetry are different from each other. Each stage may be a 360-degree stage. The received data includes a first mesh representing the first stage and a second mesh representing the second stage. Multiple simulation results are obtained using corresponding models in respective dynamic analyses of the assembly. Each model includes a set of constraints for coupling the first mesh and the second mesh. The set of constraints is associated with a group of distinct linked harmonic indices. Physical behaviors of the assembly are then calculated using one or more sets of the simulation results. Constraints are in forms of constraint equations.

Abstract: Computer-implemented systems and methods are described herein for determining mechanical properties of an electronic assembly. An input specification for a model of the electronic assembly is received, wherein the input specification includes a compressible body and a surrounding component in the electronic assembly. A geometric interference between the compressible body and the surrounding component is identified. A displacement is generated for the compressible body to account for the geometric interference. A non-linear contact is then generated between the displaced compressible body and the surrounding component. The model is updated with the displacement and the non-linear contact. Then, a resulting force equilibrium is determined within the electronic assembly based on the updated model, wherein the resulting force equilibrium is determined by removing the displacement from the updated model.

Abstract: Systems and methods are provided herein for a layered volume mesh of a physical object in an additive manufacturing process. A surface mesh representing the physical object is sliced and layered into a plurality of virtual layer planes. The surface mesh includes a plurality of nodes. Volume meshing of the modified surface mesh is performed to generate the layered volume mesh.

Abstract: A system for simulating operation of a battery pack comprising a plurality of battery modules includes an electrical model configured to simulate electrical behavior of a respective battery module and a thermal model configured to simulate thermal behavior of the respective battery module. The electrical model provides outputs coupled as inputs to the thermal model, and the thermal model provides outputs coupled as inputs to the electrical model. A coolant model is configured to couple with the thermal model, the coolant model to simulate cooling of the respective battery module based on a temperature and a heat transfer coefficient associated with the respective battery module.

Abstract: Example systems and methods are disclosed for predicting structural distortion in a part geometry created by an additive manufacturing process. An octree mesh is generated for a part geometry based on a voxel file having voxel layers. The octree mesh is coarsened, a representation of stiffness for one of the voxel layers is generated based on the coarsened octree mesh, a force vector is determined based, in part, on the coarsened octree mesh and data from a thermal analysis of the part geometry, and a layer distortion is determined based, in part, on the force vector and the representation of stiffness. The structural distortion in the part geometry is predicted based on the layer distortion.

Abstract: A first computer-aided design (CAD) model to represent a physical object is received that includes a triangle mesh with boundary condition faces. Thereafter, the triangle mesh is smoothed such that the boundary condition faces are maintained. The smoothed triangle mesh is then segmented. As part of such segmenting, a plurality quads are generated. Each of the quads is then fitted with a non-uniform rational basis spline (nurbs) patch. A second CAD model is next generated to represent the physical object which is based on the plurality of quads fitted with nurbs. Related apparatus, systems, techniques and articles are also described.

Abstract: Systems and methods are provided for generating a mesh for a computer model of a three-dimensional object. In an embodiment: a Cartesian mesh of hexahedral elements is generated for a representation of the three-dimensional object; a sweep direction is determined for the Cartesian mesh; a swept index level is assigned for each planar face of the Cartesian mesh perpendicular to the sweep direction; the hexahedral elements are grouped into a plurality of mesh groups, with each mesh group including contiguous hexahedral elements that span the same swept index levels along the sweep direction; a block volume is generated for each respective mesh group, with the block volume being defined by boundary loop edges of first and second faces of the respective mesh group; and a hexahedral mesh is generated for each of the block volumes generated for the mesh groups.

Abstract: A method for performing a thermal simulation of an additive manufacturing process that includes accessing a voxel model representing a representative system using one or more processors. The voxel model includes a first transition associated with a first group of one or more voxels transitioning between liquid and vapor, a second transition associated with a second group of one or more voxels transitioning between solid and liquid, a third transition associated with a third group of one or more voxels undergoing sinter, and a fourth transition associated with a fourth group of one or more voxels undergoing a solid state phase change. The method determines a flux imbalance metric based on a flux, a rate of change of the first transition, a rate of change of the second transition, a rate of change of the third transition, and a rate of change of the fourth transition. The method determines one or more temperatures for the representative system based on the flux imbalance metric.

Abstract: Data is received that comprises a full model for a physical object having a rotating part and a stationary part. The physical object includes fields coupled between the rotating part and the stationary part. A mesh is then generated for a portion of the physical object that includes a rotating mesh and a stationary mesh. Thereafter, a partial simulation model is created based on the full model and the mesh. Coupling relationships are established for the fields between the rotating mesh and the stationary mesh in the partial simulation model. The fields are then solved based on the coupling relationship of the partial simulation model. Thereafter, fields of the full model can be recovered based on the solved fields. Related apparatus, systems, techniques and articles are also described.

Abstract: Systems and methods are provided for generating a radar model for a target object. In embodiments, a target simulation model is received that represents one or more physical aspects of a target object, an environment simulation model is received that represents one or more physical aspects of an environment object, and a target distance parameter is received that identifies a reference distance between the target object and a radar system to be simulated. A simulation model is generated based, at least in part, on the target simulation model, the environment simulation model, and the reference distance, and further based on a target aspect angle that identifies an angular position of the target object in relation to the radar system.

Abstract: A contact problem for characterizing physical contact between two or more bodies is solved by receiving a level-set description of a geometry in a Cartesian grid comprising a plurality of cells. The geometry includes a boundary. Thereafter, the boundary is triangularized for each cell intersecting the boundary to result in a plurality of triangles. A surfacic Gauss integration rule is generated on each triangle using an interpolation of volumetric coordinates. Subsequently, a target point is computed for each Gauss point that corresponds to a projection of such Gauss point on a target surface. The computed target points are then used to integrate contact on the triangles. The problem can then be solved to compute a displacement field respecting contact conditions. Related apparatus, systems, techniques and articles are also described.