公开(公告)号：WO2008008896A3

公开(公告)日：2008-01-17

申请号：PCT/US2007/073366

申请日：2007-07-12

Applicant: EXA CORPORATION ,  CHEN, Hudong ,  ORSZAG, Steven ,  STAROSELSKY, Ilya ,  YAKHOT, Victor ,  ZHANG, Raoyang

Inventor： CHEN, Hudong ,  ORSZAG, Steven ,  STAROSELSKY, Ilya ,  YAKHOT, Victor ,  ZHANG, Raoyang

IPC: G06G7/48 ,  G06G7/50

Abstract: A fluid flow is simulated by causing a computer to perform operations on data stored in the memory to compute at least one eddy of a fluid flow at a first scale (410) and perform operations to compute at least one eddy of the fluid flow at both the first scale (410) and a second scale (420). The second scale is a finer scale than the first scale, and the computation of the at least one eddy of the fluid flow is constrained by results of the computation of the at least one eddy of the fluid flow at the first scale (420)

公开(公告)号：WO2014077969A1

公开(公告)日：2014-05-22

申请号：PCT/US2013/063241

申请日：2013-10-03

Applicant: EXA CORPORATION

Inventor： CHEN, Hudong ,  KOTAPATI, Rupesh ,  ZHANG, Raoyang ,  SHOCK, Richard ,  STAROSELSKY, Ilya ,  LI, Yanbing

IPC: G06G7/50

CPC classification number: G06F17/5018 ,  G06F17/11 ,  G06F17/5009 ,  G06F2217/16

Abstract: A computer-implemented method for simulating fluid flow using a lattice Boltzmann (LB) approach that includes assigning values for the wall shear stress on a per-facet (e.g., per-surfel) basis based on whether the fluid flow is laminar or turbulent is described herein. This description relates to computer simulation of physical processes, such as fluid flow and acoustics. This description also relates to a method for predicting the phenomena of laminar-to-turbulent transition in boundary layers.

Abstract translation: 一种用计算机实现的使用晶格玻尔兹曼（LB）方法模拟流体流动的方法，其包括基于流体流动是层流还是湍流来为每个面（例如，每冲程）分配壁剪切应力的值 在此描述。 该描述涉及物理过程的计算机模拟，例如流体流动和声学。 该描述还涉及用于预测边界层中层状湍流过渡现象的方法。

公开(公告)号：WO2013070434A1

公开(公告)日：2013-05-16

申请号：PCT/US2012/061682

申请日：2012-10-24

Applicant: EXA CORPORATION

Inventor： CHENGHAI, Sun ,  PEROT, Franck Leon ,  ZHANG, Raoyang ,  CHEN, Hudong ,  FREED, David M. ,  STAROSELSKY, Ilya

IPC: G06G7/57

CPC classification number: G06F17/5009 ,  G06F17/10 ,  G06F17/5018 ,  G06F17/5095 ,  G06F2217/16 ,  G06F2217/82

Abstract: A computer-implemented method for simulating flow and acoustic interaction of a fluid with a porous medium is described herein.

Abstract translation: 本文描述了用于模拟流体与多孔介质的流动和声学相互作用的计算机实现的方法。

公开(公告)号：WO2008021652A3

公开(公告)日：2008-02-21

申请号：PCT/US2007/073868

申请日：2007-07-19

Applicant: EXA CORPORATION ,  SHAN, Xiaowen ,  CHEN, Hudong ,  ZHANG, Raoyang

Inventor： SHAN, Xiaowen ,  CHEN, Hudong ,  ZHANG, Raoyang

IPC: G06G7/48

Abstract: Simulating a physical process [Fig. 3, item 302] includes storing, in a computer-accessible memory, state vectors for voxels, where the state vectors correspond to a model and include entries that correspond to particular momentum states of possible momentum states at a voxel. Interaction operations are performed on the state vectors. The interaction operations model interactions between elements of different momentum states according to the model. Move operations performed on the state vectors reflect movement of elements t new voxels according to the model [Fig. 3, items 310, 314; Fig. 13, items 1318, 1338, 1340]. The model is adapted to simulate a high-Knudsen number flow that has a Knudsen number greater than O. 1.

公开(公告)号：WO2015017648A2

公开(公告)日：2015-02-05

申请号：PCT/US2014/049129

申请日：2014-07-31

Applicant: EXA CORPORATION

Inventor： GOPALAKRISHNAN, Pradeep ,  ZHANG, Raoyang ,  CHEN, Hudong

IPC: G06F19/00

CPC classification number: G06F17/5009 ,  G06F17/10 ,  G06F17/5018 ,  G06F2217/16

Abstract: A method includes simulating, in a lattice velocity set, transport of particles in a volume of fluid, with the transport causing collision among the particles; and generating a distribution function for transport of the particles, wherein the distribution function comprises a thermodynamic step and a particle collision step, and wherein the thermodynamic step is substantially independent of and separate from the particle collision step.

Abstract translation: 一种方法包括在晶格速度集中模拟颗粒在一定体积流体中的传输，导致颗粒之间的碰撞; 以及产生用于颗粒运输的分布函数，其中所述分布函数包括热力学步骤和颗粒碰撞步骤，并且其中所述热力学步骤基本上与颗粒碰撞步骤无关并与颗粒碰撞步骤分离。

公开(公告)号：WO2015013507A1

公开(公告)日：2015-01-29

申请号：PCT/US2014/048004

申请日：2014-07-24

Applicant: EXA CORPORATION

Inventor： CHEN, Hudong ,  ZHANG, Raoyang ,  GOPALAKRISHNAN, Pradeep

IPC: G06F17/50

CPC classification number: G06F17/5018 ,  G06F17/11 ,  G06F17/18 ,  G06F17/5009 ,  G06F2217/16

Abstract: A method comprising: simulating, in a lattice velocity set, movement of particles in a volume of fluid, with the movement causing collision among the particles; based on the simulated movement, determining relative particle velocity of a particle at a particular location within the volume, with the relative particle velocity being a difference between (i) an absolute velocity of the particle at the particular location within the volume and measured under zero flow of the volume, and (ii) a mean velocity of one or more of the particles at the particular location within the volume; and determining, based on the relative particle velocity, a non-equilibrium post-collide distribution function of a specified order that is representative of the collision.

Abstract translation: 一种方法，包括：以晶格速度集合模拟颗粒在一定体积流体中的运动，所述运动引起颗粒之间的碰撞; 基于模拟运动，确定体积内特定位置处的颗粒的相对颗粒速度，其中相对颗粒速度是（i）在体积内的特定位置处的颗粒的绝对速度和在零下测量的 体积的流动，和（ii）体积内特定位置处的一个或多个颗粒的平均速度; 并且基于所述相对粒子速度确定代表所述碰撞的指定顺序的非平衡冲突后分布函数。

公开(公告)号：WO2019075068A1

公开(公告)日：2019-04-18

申请号：PCT/US2018/055220

申请日：2018-10-10

Applicant: EXA CORPORATION ,  MANN, Adrien ,  SUN, Chenghai ,  CHEN, Hudong ,  ZHANG, Raoyang ,  PEROT, Franck Léon

Inventor： MANN, Adrien ,  SUN, Chenghai ,  CHEN, Hudong ,  ZHANG, Raoyang ,  PEROT, Franck Léon

IPC: G06F17/50

CPC classification number: G06F17/5009 ,  G06F17/5018 ,  G06F17/5095 ,  G06F2217/82

Abstract: The description describes one or more processing devices and one or more hardware storage devices storing instructions that are operable, when executed by the one or more processing devices, to cause the one or more processing devices to perform operations including modeling the porous material as a two-dimensional interface, in a simulation space, in which fluid flows and sound waves travel through the porous material and experience pressure and acoustic losses. The operations also include simulating, in the simulation space, fluid flow and propagation of sound waves, the activity of the fluid being simulated so as to simulate movement of elements within the simulation space and across the interface, where the simulation of the movement of the elements across the interface is governed by the model.

公开(公告)号：WO2017123435A1

公开(公告)日：2017-07-20

申请号：PCT/US2017/012079

申请日：2017-01-04

Applicant: EXA CORPORATION

Inventor： SUN, Chenghai ,  PÉROT, Franck Léon ,  ZHANG, Raoyang ,  CHEN, Hudong ,  FREED, David M. ,  STAROSELSKY, Ilya ,  MANN, Adrien

IPC: G06F17/50 ,  G06G7/48 ,  G06G7/60

CPC classification number: G06F17/5009 ,  G06F17/18 ,  G06F17/5018 ,  G06F2217/82

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for processing data representing the effect of tortuosity on the acoustic behavior of a fluid in a porous medium. One of the methods includes generating by a first data processing program of the data processing apparatus, a model of acoustic behavior of a fluid in a porous medium including an effect of tortuosity, with the model comprising a time variable indicative of a sound speed of the fluid. The method includes rescaling the time variable of the model based on the sound speed in a fluid in the porous medium. The method also includes simulating the acoustic behavior including the effect of tortuosity of the porous medium based on the rescaling of the time-related variables within the model.

Abstract translation: 包括计算机存储介质上编码的计算机程序的方法，系统和装置，用于处理表示曲折度对多孔介质中流体的声学行为的影响的数据。 其中一种方法包括由数据处理设备的第一数据处理程序产生多孔介质中的流体的声学行为模型，该模型包括曲折效应，该模型包括指示 流体。 该方法包括基于多孔介质中的流体中的声速来重新缩放模型的时间变量。 该方法还包括基于模型内的时间相关变量的重新缩放来模拟包括多孔介质的曲折效应的声学行为。

公开(公告)号：WO2014186545A1

公开(公告)日：2014-11-20

申请号：PCT/US2014/038143

申请日：2014-05-15

Applicant: EXA CORPORATION ,  FAGER, Andrew

Inventor： FAGER, Andrew ,  CROUSE, Bernd ,  NIE, Xiaobo ,  ZHANG, Raoyang ,  LI, Yong ,  OTOMO, Hiroshi ,  CHEN, Hudong

IPC: G06G7/50

CPC classification number: E21B49/00 ,  E21B43/16 ,  G01V99/005 ,  G06F17/5009

Abstract: This description relates to computer simulation of physical processes, such as computer simulation of multi-species flow through porous media including the determination/estimation of relative permeabilities for the multi-species flow through the porous media.

Abstract translation: 该描述涉及物理过程的计算机模拟，例如通过多孔介质的多物质流动的计算机模拟，包括通过多孔介质的多物质流的相对渗透性的确定/估计。

公开(公告)号：WO2013085567A1

公开(公告)日：2013-06-13

申请号：PCT/US2012/040121

申请日：2012-05-31

Applicant: EXA CORPORATION ,  CHEN, Hudong ,  ZHANG, Raoyang

Inventor： CHEN, Hudong ,  ZHANG, Raoyang

IPC: G06G7/50

CPC classification number: G06F17/5018 ,  G06F2217/16

Abstract: A computer-implemented method for simulating fluid flow using a lattice Boltzmann (LB) approach and for solving scalar transport equations is described herein. In addition to the lattice Boltzmann functions for fluid flow, a second set of distribution functions is introduced for transport scalars.

Abstract translation: 本文描述了使用格子玻尔兹曼（LB）方法模拟流体流动并用于求解标量传输方程的计算机实现的方法。 除了用于流体流动的晶格玻尔兹曼函数之外，引入了用于传输标量的第二组分布函数。