This describes the typical setup of a scale-resolving simulation with TRACE.

Discontinuous Galerkin solver

Due to its high-order accuracy and advantageous dispersion and dissipation characteristics, the Discontinuous-Galerkin solver is the recommended solver for Large Eddy Simulations (LES) and Direct Numerical Simulations (DNS). The best practice guidelines are presented in Discontinuous Galerkin spatial discretization scheme .

Finite volume solver

Hybrid RANS/LES methods

This solver offers hybrid RANS/LES capabilities.

LES methods

The recommended GMC setup for LES is

LES WALE model
Third Order MUSCL scheme with Limiter Off
3rd order Explicit Runge-Kutta time integration

Make sure to switch the numerical flux to either Central using the control file command SetRiemannSolver

all immediate SetRiemannSolver Central

or a low percentage (0.1-1%) of upwind using SetRiemannSolverBlendingConstant

all immediate SetRiemannSolverBlendingConstant 0.001

Analysis

3D Statistics

A long time cumulative average of the whole domain can be set up using ComputeStatistics.

all immediate ComputeStatistics --filename ../output/cgns/TRACE.statistics.cgns --moment 2 --averages --timestep <start> --samplingInterleave <interleave> --storePermanentInterleave <permanentInterleave>

It is recommended to use the --averages option as this will become the default from 9.5 onwards.
The time step at which sampling should be started can be controlled by --timestep.
A reasonable sampling interleave should be defined for efficiency reasons.
As the output file will get updated over time, it is good practice to store a series of statistics files using --storePermanentInterleave to be able to judge statistical convergence.

POST can then be used to compute the statistical moments using

POST -i ../output/cgns/TRACE.statistics.cgns --computeStatisticalValues --removeAllStatisticsSums -o ../output/cgns/POST.statistics.cgns

Probe time series

Time series at predefined points can be sampled using DoProbe.

Co-processing

Co-processing with ParaView Catalyst can be used to extract images directly from the simulation or use ParaView filters to extract data on subdomains.