MPPICInterFoam reproduces a clear-water jet to within the measurement uncertainty, once an inlet error of ours is corrected, but it misses both sediment experiments we tested: a dense sand cloud and a dilute particle-laden jet. In the dilute jet, the particle flux on the axis at 41 nozzle diameters is Read more
About 95 RANS simulations of the NASA backward-facing step in OpenFOAM and code_saturne: which mesh defects break convergence, and what limiters really do.
Every fire engineer who designs a stair pressurization system ends up asking the same question: is a multizone airflow network enough, or do I need CFD? CONTAM, NIST’s multizone airflow and contaminant transport code, solves a whole building in seconds. FDS, NIST’s Fire Dynamics Simulator, resolves the flow in three Read more
We ran the Steckler room fire (Test 14) in FDS and OpenFOAM 14 on the same grid, with a volumetric heat source and a passive soot scalar in OpenFOAM: temperatures, door flows, soot density, visibility and cost.
We ran the classic dam break with an obstacle in OpenFOAM 14, OpenFOAM v2606 (with AMR) and DualSPHysics on cloudHPC: how close VOF and SPH come on the same geometry, against the experiment, and what each run cost.
OpenLB is an open-source lattice Boltzmann (LBM) framework written in C++. It is used for flows that are awkward for classical finite-volume codes: complex geometries, porous media, particle-laden and multiphysics problems. Because the lattice Boltzmann method is local and explicit, it maps very well to GPUs, and OpenLB has a Read more
Elmer FEM is an open-source finite element code from CSC (Finland) that many engineers use for heat transfer, structures, electromagnetics and fluids. Before trusting any solver for real work, it is worth asking a simple question: does it solve the equations it claims to solve, and does the error shrink Read more
Short version. We built a 20.7-million-cell large-eddy simulation (LES) of the flow past a circular cylinder at Re = 3900, ran it with code_saturne 9.0.1 on six cloudHPC configurations (32, 48 and 96 cores on hypercore; 32, 48 and 112 cores on highcore) and repeated every configuration with two mesh Read more
FDS, OpenFOAM, code_aster, EnergyPlus, OpenRadioss and more: describe what you need in plain language, and your AI assistant prepares, checks, launches and analyses the simulation on cloudHPC. Running a simulation in the cloud has always meant many small technical steps: compressing the case, choosing vCPU and RAM, checking the input Read more
The classic design loop in CFD goes like this: guess a shape, mesh it, simulate it, look at the result, tweak the geometry, repeat. It works when a design has three or four parameters. It stops working when the shape is described by dozens or hundreds of variables, because nobody Read more