Simulation for Real World Answers
The core of FE analysis is discretization: the splitting of a complex problem into ‘discrete’ and ‘finite’ simpler elements which allows for computation. Both idealization of the problem and discretization introduce inaccuracy and the possibility of outright error. DRG’s DNA has always been to treat the situation as a real world problem requiring an engineering answer. As such, we quote, configure, and execute analysis projects from an ‘answer centric’ viewpoint: letting the client’s need drive the simulation.
Finite Element Analysis Capabilities:
Both packages we use, NX Nastran and Autodesk InCAD, contain a full breadth of capabilities in materials, solvers, formulations, and post-processing. The descriptions below represent DRG’s experienced skill set in the analysis engines.
· Static linear analysis
· Non-linear analysis
· Transient / time based simulations
· Vibration analysis
· Material specific analysis
CFD Capabilities (Computational Fluid Dynamics)
In pursuing a comprehensive mechanical service, DRG added thermal and flow analysis capabilities with CD Adapco’s Star CCM+. This world class software allows us to simulate flow and thermal problems to verify and optimize designs. For over a decade, DRG has used CFD for standalone projects and integrated support for larger design programs.
The advent, in recent years, of cloud computing has dramatically improved the effectiveness of CFD when integrated into a design program. Simulations that used to occupy a week of schedule can now be analysed in one day, allowing us to inform design decisions with minimal delay in the program.
· Incompressible flow
This is the simplest model for flow and the one most commonly employed by DRG. Whether it is optimizing a venturi pump, predicting grill effects on a fan, or verification of mixing for waste water treatment, DRG uses the full suite of tools Star CCM+ offers for this flow regime.
· Thermal analysis
Modelling heat rise can take many forms and requires a range of physical models. Buoyancy flow (free convection), complex conduction models, radiative heat exchange, and forced conduction all can play a role. DRG has developed expertise in system simplification to effectively model thermal problems for both design guidance and design verification.
· Compressible flow
CFD analysis of compressible flow can be extremely complicated and without a detailed understanding of the applicable physics can easily become a research project. DRG's in house CFD software has powerful capabilities for these problems but we choose to employ only a subset of Star CCM+'s capabilities for compressible flow as applied to situations where we are confident in the physics.