Meshless CFD with SIMSOLID

Meshless CFD with SIMSOLID

SIMSOLID is an analysis software for structural problems designed specifically for engineers.  By eliminating geometry meshing and simplification SIMSOLID dramatically reduces the amount of time and expertise required for even complex FEA. 

Meshless and finite element analysis are rarely mentioned in the same sentence. For decades the general understanding is that you need to spend 80% of your effort on fine-tuning a mesh in order to get a good FEA result. This process is based on the underlying mathematics and the numerical method used for the prediction of how part or assembly behaves under certain conditions. 

FEA was independently developed by researchers in different universities and industries to address structural mechanics problems related to aerospace and civil engineering. The development for use and applications started around the mid-1950s as papers by Turner, Clough, Martin and Topp [1956], Argyris [1957] and Babuska and Aziz [1972] show.

So why is the history important? Because the fundamentals of solving problems with mathematics using meshing were invented 75 years ago and advanced in the decades since then. Doesn’t it make sense that additional advancements in mathematics can further our understanding of how to solve these complex problems?

SIMSOLID can analyze large assemblies and complex parts that simply cannot be analyzed on a desktop computer with traditional FEA techniques. Using a multi-pass adaptive analysis, SIMSOLID controls solution accuracy.  
The breakthrough extensions to the theory of external approximations are the basis for the SIMSOLID computational engine. External approximations are a generalization of Finite Element Method (FEM) in terms that:

  • absolutely arbitrary geometrical shapes can be used as “finite elements”
  • basis functions which approximate field of interest in the part volume can be of arbitrary class and are independent of the volume shape

SIMSOLID DOF are functionals with geometrical support in the form of volumes, areas, line clouds, and point clouds and SIMSOLID does not use the point-wise degrees of freedom (DOF) inherent in traditional FEA – providing the ability to handle geometrical imperfections, as well as assembly contact imperfections like gaps, penetrations and ragged contact areas.

SIMSOLID controls solution accuracy using multi-pass adaptive analysis.  Adaptivity can be defined on a global or part local basis and adaptivity is always active. The SIMSOLID methodology is fast and efficient.  It provides superior performance metrics for computational time and memory footprint that allow very large and/or complex assemblies to be solved quickly on desktop class PC’s.

Simulation Types

  • Linear Statics
  • Modal
  • Thermal
  • Thermal Stress
  • Geometric Nonlinear Statics
  • Material Nonlinear Statics
  • Dynamics time, frequency and random response

Geometry Sources

  • Direct data integration to Autodesk Fusion 360, SOLIDWORKS and Onshape CAD systems
  • Standard STL output from any CAD system
  • Direct file support for mainstream CAD systems: CATIA, NX, Creo, SOLIDWORKS, Inventor and Solid Edge
  • Direct file support for common neutral formats: STEP, ACIS and Parasolid, etc.

Material Properties

  • Isotropic
  • Incompressible
  • NL stress vs strain curves
  • Rigid
  • User extensible


Image thumbnails and captions associated with:

  • Model graphics state
  • Part visibility
  • Results display
  • Synchronized model and results browsing
  • Exported as full resolution image files

Assembly Connections

  • Smart auto connections
  • Bonded
  • Sliding
  • Separating
  • Bolted
  • Spot & laser welds
  • Fillet/seam welds
  • Virtual connectors

Boundary Conditions

  • Prescribed:
    • displacement
    • pressure, force
    • gravity
    • temperature, flux
    • convection
    • volumetric heat
  • Force at a remote point
  • Hinge constraints
  • Spring support
  • Hydrostatic & bearing loads
  • Inertia loads


  • Contour plots
    • displacement
    • stress
    • strain
  • Deformed shape animation
  • Max/min labels
  • Point probes
  • XY plots
  • Reaction/contact forces
  • Bolt/nut forces
  • Spot weld forces
  • Modal participation factors
  • Safety factors