Computer system for digitally simulating pseudo-incompressible fluid flow in a computer aided design model

A method for digitally simulating a fluid flow in a three-dimensional computer-aided design (CAD) model of a simulation space, the method comprising:

• reading, by a data processing system, a digital representation of a simulation space based on a digital three-dimensional CAD model, the digital representation comprising a mesh comprising a plurality of voxels;
• digitally simulating, by the data processing system, movement of one or more digital particles representing the fluid from one or more first voxels to one or more second voxels in the digital representation of the mesh, wherein the one or more digital particles are associated with an energy state and a lattice velocity;
• performing, by the data processing system, one or more interaction operations on the one or more digital particles at the one or more second voxels to determine a distribution of the one or more digital particles;
• wherein a first quantity represented by the distribution of the one or more digital particles at the one or more second voxels is based on a temperature and a pressure at the one or more second voxels and a reference fluid density;
• and
• wherein a second quantity represented by the distribution of the one or more digital particles is based on the reference fluid density, velocities of the one or more digital particles, and a mean fluid velocity.

One or more non-transitory machine-readable storage devices storing instructions for digitally simulating a fluid flow in a three-dimensional computer-aided design (CAD) model of a simulation space, the instructions being executable by one or more processors, to cause performance of operations comprising:

• reading a digital representation of a simulation space based on a digital three-dimensional CAD model, the digital representation comprising a mesh comprising a plurality of voxels;
• digitally simulating movement of one or more digital particles representing the fluid from one or more first voxels to one or more second voxels in the digital representation of the mesh, wherein the one or more digital particles are associated with an energy state and a lattice velocity;
• performing one or more interaction operations on the one or more digital particles at the one or more second voxels to determine a distribution of the one or more digital particles;
• wherein a first quantity represented by the distribution of the one or more digital particles at the one or more second voxels is based on a temperature and a pressure at the one or more second voxels and a reference fluid density;
• and
• wherein a second quantity represented by the distribution of the one or more digital particles is based on the reference fluid density, velocities of the one or more digital particles, and a mean fluid velocity.