FAQ

General

 

Can I try the EXN/Aero solver? Yes, we can set you up with a complimentary trial via our cloud solution. It activates GPUs and CPUs on an as-needed basis.

 

 

I don’t have a GPU enabled system, do I need that first before considering EXN/Aero?  As GPU computing is only now becoming mainstream, many find themselves in this predicament.  Our cloud solution takes care of this problem, allowing you to access the power of GPU computing without upfront investment.  We offer complimentary trials on our cloud platform so you can evaluate EXN/Aero firsthand.  For those who wish to own their own hardware, we work directly with GPU system providers and can customize a solution based on your specific needs.

Meshing

Do you bundle a mesher with your software? No we do not bundle a meshing tool. 

What types of meshing tools do you recommend? If you want to take the full advantage of the speed up capabilities, we recommend going with a meshing tool that can output structured & unstructured data in one file. Pointwise, Gridpro, and BETA Ansa all support this capability. We support ICEM multiblock also, though you need to output structured and unstructured blocks separately. We have utilities for merging files as part of the pre-solver workflow.

What file type do I need to export to? CGNS

What are the cell types supported by your solver? Typical meshes generated by our current meshers can contain all types (hexahedrons, prisms, wedges, pyramids, tetrahedrons and polyhedrons). We support mesh types that the CGNS standard supports. This includes Cartesian structured, and on the unstructured side it includes, tetrahedral, hex, prism, wedges, pyramids. 

Is there significant performance penalties associated with certain file types? Performance is practically always better with structured (meaning grid and data both structured) mesh blocks. These run around 2x faster than unstructured blocks of equivalent size. To get the most out of our solver, we usually limit the use of unstructured blocks only to where it is necessary to  resolve geometry. That being said, our solver does support fully unstructured meshes. 

Post Processing

What post-processing tools can be used with EXN/Aero’s output files (VTK,VTU)? VTK/VTU files are native to Paraview, which is a robust and open-source data-analysis and visualization tool.  Tecplot also supports VTK/VTU format and any program which supports VTK/VTU files should be compatible.

Can I output different parts of the solution at different frequencies? EXN/Aero provides separate output files (VTK) for the internal domain and each boundary; these are grouped together (VTU) for a given timestep.  The user can chose to export a specific boundary at a frequency which is different from the solution output rate.  This can be advantageous if the transient behaviour on a surface (surface pressure for example) is of interest.

Solver

I need statistics from large transient simulations, can I do that without outputting solutions for every timestep? Yes, there are two ways this can be done.  1) If you are only interested in a collection of discrete locations monitor points can be inserted into the simulation to report time-resolved values of interest.  2) If you need statistics for an entire field, EXN/Aero includes an online statistics calculator which calculates statistics on the fly without intermediate outputs.  This method is exact in the mean and will converge in the variance for a statistically stationary process.

What operating system does the solver run on? Linux

Can I monitor my results and see the residuals as the mesh is running? Yes, we have a monitoring tool

Do I required GPUs to use the software? No, the solver can operate on GPU only, CPU only, and GPU / CPU hybrid environments

What types of turbulence models are built in? K-omega, SST, DES/LES