Abstract: Systems and methods are provided for generating a surface that approximates one or more CAD surfaces. An input that approximates the one or more CAD surfaces via a plurality of triangles is received. A mesh of equilateral triangles is generated on the input, with the mesh including vertices that lie on the input. Vertices of the mesh are moved to generate a control mesh, the control mesh having a corresponding limit surface that passes through all of the vertices of the mesh. A local refinement is performed on one or more regions of the control mesh that have an error that is greater than a threshold value, where the local refinement causes the limit surface of the control mesh to more closely approximate the one or more CAD surfaces. The mesh is parameterized to generate a two-dimensional (2D) representation of the mesh.

Abstract: Systems and methods are provided for modeling fluid flow in a turbomachine. A specification of a system including first and second blade rows is received. A wake profile from the first blade row is imposed on the second blade row to approximate an influence of the first blade row on the second blade row. Governing flow equations for the fluid flow in the second blade row are transformed in time. Flow variables of the transformed governing flow equations are represented as a Fourier series, and the Fourier series representation is substituted into the transformed governing flow equations to obtain a modified form of the transformed governing flow equations. A pseudo-time term is introduced into the modified form of the transformed governing flow equations. The modified form of the transformed governing flow equations is solved using the steady-state solution method to model the fluid flow in the second blade row.

Abstract: Systems and methods are provided for simulating an electrical characteristic of an electronic device having input ports and output ports. A device frequency response data structure is accessed that contains data associated with a plurality of port-to-port frequency responses of the electronic device, each port-to-port frequency response being associated with a plurality of frequencies. A QR decomposition is performed based on data from the frequency response data structure. A subset of the port-to-port frequency responses is selected based on the QR decomposition. A set of common poles is identified using the selected subset of port-to-port frequency responses, and a model of time domain behavior of the electronic device is generated using the set of common poles.

Abstract: Method and apparatus for reducing chemical reaction mechanisms are disclosed. A method comprises obtaining data for one or more chemical species in a chemical reaction model from a database, the database including properties of the one or more chemical species; grouping the chemical species in a chemical reaction model into one or more isomer groups according to molecular properties of the chemical species; assigning a representative isomer to at least one isomer group; replacing, in one or more chemical reaction equations of the chemical reaction model, one or more groups of chemical species with a corresponding representative isomer; and executing the chemical reaction model by an apparatus to determine results.

Abstract: Rapid calculation of magnetostriction effects can consist of calculating a stress field and a magnetic field in a structure by determining a magnetic field on the magnetic mesh, determining a magnetostriction from the magnetic field, applying the magnetostriction to the mechanical mesh, determining a stress field on the mechanical mesh, determining an inverse magnetostriction from the stress field, applying the inverse magnetostriction to the magnetic mesh, and determining a new magnetic field on the magnetic mesh by accounting for the inverse magnetostriction. Calculations can be based on data representing a structure, including a magnetic mesh, a mechanical mesh, and a plurality of material properties. After calculation is completed, data characterizing the calculated stress field and magnetic field for the structure can be provided as output. Related apparatus, systems, techniques, methods and articles are also described.

Abstract: Systems and methods are provided for executing a simulation of a physical system that includes a plurality of objects representing physical entities or phenomena. Parameters of objects currently present in a simulation are evaluated. When one of the parameters is in an invalid state, a first multi-layer context menu is provided having multiple selectable options on each layer on a graphical user interface, where a first layer includes a highlight indicating that an object needs fixed, and where a subsequent layer includes a highlight indicating an identity of the object that needs fixed. The objects currently present in the simulation are evaluated based on a task to be performed. When a required object for the task to be performed is missing from the simulation, a second multi-layer context menu having multiple selectable options on each layer is provided.

Abstract: Systems and methods are provided for modeling fluid flow in a turbomachine. A specification of a system including at least a stator and a rotor of a turbomachine is received. The stator is coupled to the rotor via a profile-transformation (PT) interface. A flow profile for fluid flow across the PT interface is expanded or compressed based on a pitch ratio between the stator and the rotor. Flow variables of governing flow equations for the fluid flow in the system are represented as a Fourier series with spatially-varying Fourier coefficients. The Fourier series representation is substituted into the governing flow equations to obtain a modified form of the governing flow equations. The modified form of the governing flow equations is solved using a steady-state solution method to model the fluid flow in the system. The modeling utilizes an implicit solution discretization across the PT interface.

Abstract: Systems and methods are provided for system for generating a physical model for engineering design or visualization. A system includes a processor-readable memory that further includes one or more data structures containing physical data associated with points in a three dimensional volume. A system also includes a plurality of data processors that operate in parallel to perform calculations using the physical data to generate a physical model for providing real-time visualization and calculation associated with the three dimensional volume.

Abstract: Systems and methods are provided for approximating an electric current on a surface of an object. A mesh is received. A matrix comprising a system of equations is generated based on the mesh. An entry of the matrix is associated with (i) a source function that approximates an electric current on the surface of the object, and (ii) a test function that tests a field of the source function on the surface. A near part of the matrix and a far part of the matrix are determined. The far part of the matrix is represented using a submatrix that is based on Gaussian points on elements of the mesh. The electric current on the surface of the mesh is calculated by solving the system of equations of the matrix.

Abstract: Systems and methods are provided for modeling fluid flow in a turbomachine. A specification of a system is received. The system includes multiple passages, where the multiple passages include at least an inlet guide vane, a rotor, and a stator. A computational grid is generated with a processing system based on the received specification. Governing flow equations for the system are transformed based on inclination parameters, where each passage of the system has an associated inclination parameter. A rotational velocity of rotating passages included in the system is specified, and a time-step for stationary passages included in the system is specified. Time-steps for the rotating passages included in the system are computed, where the time-steps are computed based on pitch-ratios for adjacent passages of the system. A solution for the system is advanced in time by solving the transformed governing flow equations across the computational grid using computer-based numerical calculations.

Abstract: Systems and methods are provided for analyzing an electromagnetic field in an original domain. An original domain is decomposed into one or more finite-element-boundary-integral (FEBI) regions and one or more integral-equation (IE) regions. A model is determined for an electromagnetic field in the one or more FEBI regions and the one or more IE regions. An initial block system matrix for the original domain is generated based at least in part on the model. The initial block system matrix includes a first diagonal block corresponding to the one or more FEBI regions and a second diagonal block corresponding to the one or more IE regions. A replacement matrix is generated based at least in part on a physical optics (PO) method. A final block system matrix is generated by replacing the second diagonal block in the initial block system matrix with the replacement matrix.

Abstract: An example circuit includes: a first clock gating circuit coupled between a first latch and a second latch and configured to provide a first gated clock signal based at least in part on an input clock signal. The first latch is configured to be activated in response to the first gated clock signal being at a first logic level to pass a data input. The second latch is configured to be activated in response to the input clock signal being at a second logic level to pass a first selection signal.

Abstract: The current subject matter provides for the generation of network models for multi-chip module packages that are a combination of compact models for each chip within such packages. In some variations, a combination of single chip extraction methods and a linear superposition technique can be used to predict junction temperatures of MCM packages. Related methods, systems, apparatus, and articles are also described.

Abstract: Systems and methods are provided for performing parallel transient simulations for an electrical circuit. A plurality of segments are generated from a simulation length, and simulations are performed using a plurality of processors for the segments to generate simulation results. An output is generated based at least in part on the simulation results.

Abstract: Systems and methods are provided for estimating a temperature of a wire of an integrated circuit (IC) chip having a plurality of heat-generating components. For each of the heat-generating components, a temperature of the heat-generating component is computed. For each of the heat-generating components, a decay profile defining a thermal coupling from the heat-generating component to wires of the IC chip is computed. For each of the heat-generating components, a temperature elevation on the wire caused by the heat-generating component is computed. The temperature elevation is computed based on the temperature and decay profile of the heat-generating component and a spatial relationship between the wire and the heat-generating component. A total temperature elevation on the wire is computed by summing the temperature elevation of each of the heat-generating components. The heat-generating components include a plurality of wires of the IC chip and at least one device of the IC chip.

Abstract: Systems and methods are provided for heat transfer simulations. Mesh generation is performed for a plurality of regions. Mesh faces are determined on different sides of an interface between the regions and overlapping areas between the determined mesh faces are determined. A total heat flow associated with the interface is discretized based at least in part on the one or more overlapping areas for heat transfer simulations.

Abstract: Systems and methods are provided for analyzing magnetic hysteresis. A reversible component associated with an applied magnetic field is determined for establishing a series-distributed model. One or more hysteresis loops are generated for analyzing magnetic hysteresis of a magnetic material.

Abstract: Systems and methods are provided for determining a confidence level on contact pairs identified through traditional contact detection algorithms for an assembly of bodies. A plurality of testing tolerances are identified. For each of the identified testing tolerances, a determination is made as to whether a distance between any two faces of the bodies in the assembly is less than that identified testing tolerance and when this happens a count of positive detections is increased. A ratio of the count of positive detections to the total number of times the detections are run tolerances is determined (called repeatability of a face pair), where the confidence level is based on the determined repeatability ratio.

Abstract: A model synthesizer generates a state-space model of a structure from frequency domain parameters of the structure using a selected number of significant eigenvalues of a matrix derived from the frequency-domain parameters such that the quality of the fit of the model is improved. A matrix of the frequency-domain parameters is reshaped so as to improve performance of determination of the fit quality. Passivity violations in the model can be removed via regularization and error control such that the fit quality of the model after removal of the passivity violations is within a specified tolerance. Cholesky factorization can improve the performance of passivity violation detection. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.

Abstract: Systems and methods are provided for constructing a physical system. Characteristic data associated with a physical system is received. A model of the physical system is built based on the characteristic data. A nonlinear transient simulation of the physical system is performed using the model, where the simulation is performed over a plurality of time intervals. The simulation includes segmenting the plurality of time intervals into groups of time intervals, each group containing multiple time intervals, transmitting data associated with each group of time intervals to a different solving unit, and solving each of the groups of time intervals in parallel using the different solving units. A physical characteristic is determined based on results of the simulation, where the physical system is built or modified based on the simulation-determined physical characteristic.