A fluid analysis simulation apparatus based on smoothed particle hydrodynamics (SPH) includes a modeling unit that generates a mesh-based structure model composed of a plurality of polygons and a plurality of particles located inside the structure model, a polygon information generation unit that generates polygon information for each of the plurality of polygons, a cell information generation unit that partitions a space where the plurality of particles and the plurality of polygons exist into a plurality of cells and generates cell information for each of the plurality of cells, and a collision determination unit that determines a possibility of collision between a particle and a polygon based on data about the plurality of particles, the polygon information and the cell information.

A fluid analysis simulation apparatus based on smoothed particle hydrodynamics (SPH) includes a modeling unit that generates a mesh-based structure model composed of a plurality of polygons and a plurality of particles located inside the structure model, a polygon information generation unit that generates polygon information for each of the plurality of polygons, a cell information generation unit that partitions a space where the plurality of particles and the plurality of polygons exist into a plurality of cells and generates cell information for each of the plurality of cells, and a collision determination unit that determines a possibility of collision between a particle and a polygon based on data about the plurality of particles, the polygon information and the cell information.

A fluid analysis simulation apparatus based on smoothed particle hydrodynamics (SPH) includes an input unit that receives data about a plurality of particles for fluid analysis simulation, a measurement space setting unit that sets a measurement space where a water level is to be measured in a space where the plurality of particles exists, a sampling space generation unit that divides the measurement space into a plurality of sampling spaces formed in a height direction of the measurement space, and a water level measurement unit that measures a water level in the measurement space based on a height of a particle included in each sampling space.

A fluid analysis simulation apparatus based on smoothed particle hydrodynamics (SPH) includes an input unit that receives data about a plurality of particles for fluid analysis simulation, a measurement space setting unit that sets a measurement space where a water level is to be measured in a space where the plurality of particles exists, a sampling space generation unit that divides the measurement space into a plurality of sampling spaces formed in a height direction of the measurement space, and a water level measurement unit that measures a water level in the measurement space based on a height of a particle included in each sampling space.

A particle-based fluid analysis simulation method, which uses dummy particles and is performed in a fluid analysis simulation device, comprises the steps of: modeling a simulation area, including a plurality of particles, for a fluid; generating at least one dummy particle required for fluid analysis simulation of the simulation area, and arranging the at least one dummy particle outside the simulation area; calculating flow data of the plurality of particles by using the at least one dummy particle arranged on the outside; and performing the fluid analysis simulation of the simulation area on the basis of the calculation result, wherein the number of the at least one dummy particle is varied while the fluid analysis simulation is being performed.

A particle-based fluid analysis simulation method, which uses dummy particles and is performed in a fluid analysis simulation device, comprises the steps of: modeling a simulation area, including a plurality of particles, for a fluid; generating at least one dummy particle required for fluid analysis simulation of the simulation area, and arranging the at least one dummy particle outside the simulation area; calculating flow data of the plurality of particles by using the at least one dummy particle arranged on the outside; and performing the fluid analysis simulation of the simulation area on the basis of the calculation result, wherein the number of the at least one dummy particle is varied while the fluid analysis simulation is being performed.

Processes for optimizing the geometry of a blade for use in a propeller are disclosed. In one exemplary process, an optimization routine that generates new blade geometries based on structural parameters and calculates performance parameters of each blade geometry, including aerodynamic performance parameters, farfield acoustic parameters, and/or electrical power requirements to operate a propeller having the blade geometry, is performed. The optimization routine receives design parameters and weightings from a user and can use one or more surrogate algorithms to map a design space of the weighted values of the design parameters to find their local minima. The optimization routine then determines an optimized blade geometry using a gradient-based algorithm to generate new blade geometries to explore the minima until the weighted values of the design parameters converge at an optimized blade geometry representing the global minima of the design space.

A smoothed-particle hydrodynamics (SPH)-based fluid analysis simulation apparatus comprises: an input unit for receiving, as an input, data about a plurality of particles, for a fluid analysis simulation; a space formation unit that divides, into a plurality of cells, the space in which the plurality of particles are present, and generates cell indexes on the basis of the locations of the cells in the space where the plurality of particles are present; a particle search unit for searching for at least one neighboring particle that neighbors a target particle, on the basis of particle reference information about the plurality of particles and cell reference information about the plurality of cells; and a flow data calculation unit that calculates flow data between the target particle and the at least one neighboring particle, and performs a fluid simulation on the basis of the flow data for the plurality of particles.

Methods, systems, and apparatus for generating a recipe for a concrete mixture, comprising: obtaining an optical characterization of a set of particles; determining, based on the optical characterization, physical characteristics of the set of particles; generating a multispherical approximation of the set of particles; selecting, based on the physical characteristics of the set of particles and from a database of performance rules, performance rules applicable to the set of particles; predicting performance of a proposed recipe for a concrete mixture formed from the set of particles by: determining a wet flowability rating of the proposed recipe based on the selected performance rules; and determining a dry packing rating of the proposed recipe based on the multispherical approximation; iteratively altering the proposed recipe and predicting performance of the altered proposed recipe until the predicted performance satisfies performance criteria to obtain a final recipe; and outputting the final recipe.

A gas diffusion simulation method for simulating diffusion of a gas in a porous material having many pores, the method includes: calculating, in the pores, a Knudsen diffusion coefficient based on the mean square displacement of first gas particles in spaces surrounded by wall surfaces and a Knudsen diffusion term using the Knudsen diffusion coefficient, calculating an interdiffusion term using an interdiffusion coefficient between the first gas particles and second gas particles different therefrom, and performing simulation of the gas diffusion of the first gas particles by using a diffusion equation of the first gas particles represented by the sum of the Knudsen diffusion term and the interdiffusion term.