VS Flow CFD Software is one of the core simulation software tools that out CFD consultant use for our CFD simulation analysis at our Singapore offices in BroadTech Engineering.
What is VSFLOW
VSFLOW is a simulation tool for
• General purpose CFD & Multiphysics analysis
• Customized physics-based simulations
• Runs mainly in Linux platform
The CFD software is available in following versions:
• Distributed as ready to use Open Virtualization Format Archive (ova) file
• Full installation using Windows Subsystem for Linux (WSL)
• Distributed as a customized package to be installed directly in the server/workstations
Why VSFLOW & What is New in it?
• Low product & License cost
• Dedicated solvers & features to suit specific needs
• Simulation Accuracy on par with other commercial CFD Software tools available in the market
• Quick and Easy Customization
• Extended & Comprehensive Technical support
• No limitation on parallel processing
Features of VSFlow CFD Software (GUI)
• GUI options for easy case setup
• Easy native mesh generation options
• Flexible mesh import options (ANSYS, Star CCM+, SALOME, Hyper Mesh & etc)
• Mesh manipulation
• Internal & Boundary conditions menu
• Turbulence model, fluid properties menu
• Advanced numerical schemes selection
• Dedicated solver selection option
• Solver & solution control option
• Easy initialization
• Parallel or serial run options
• Special turbo setup menu (Fans, pumps & turbines)
• Simulation automation options (Batch run)
• Optimization & parametric studies
• Paraview launcher
• Monitoring (Force, flowrate)
• Residual plots
• Averaging or integration of fields
• Turbo efficiency plots for fans & pumps
• Case simulation report generation
VSFlow is built-in with dedicated solvers to cover different nature of problems and physics
Steady-state based solvers
• Steady solver – Incompressible laminar/turbulent flows
• Steady solver CT – Compressible laminar/turbulent flows
• Steady HT solver – Compressible buoyant, turbulent, radiation & heat transfer
Transient-state based Solvers
• Unsteady solver – Incompressible laminar/turbulent flows
• Unsteady solver CT – Compressible laminar/turbulent flows
• Unsteady solver DyM – Incompressible laminar/turbulent flows with dynamic mesh
• Unsteady HT solver – Compressible buoyant, turbulent, radiation & heat transfer
• 2 Phase flow solver – Incompressible, isothermal, VOF based 2 phase flow
Featured CFD Software Simulation Case Studies
CFD Simulation of MicroChannel Flow with High Knudsen Number
Objective: CFD simulations to study flow in microchannel and microtubes for high Knudsen number flow.
Approach: Developed code/scripts to automate simulation and analyze functionality using object-oriented programming in Python for high Knudsen number flow.
Results: Because for unconventional rocks like Shale, Knudsen number is high due to high pressure and smaller length scales. Therefore, to study the behavior of flow in high Knudsen number is very important.
Design Optimization of Coolant Filter Efficiency
Objective: For a given design space provide an optimized filter with keeping pressure drop as a constraint.
Approach: Comparison of two concepts in the given design space to design an efficient filter
Analyzed many iterations varying the dimensions of the filter keeping pressure drop as a constraint DOE method was used to obtain an optimum design which yielded required pressure value for the concepts given
Outcome: One of the concepts out of two were accepted by the customer and further taken for a prototype.
External flow analysis of an Electric vehicle with a Passive Filtration System
External flow analysis to replicate the wind tunnel testing of the vehicle. Perform a full fan modeling using MRF approach to resolve the fan
The Cd of the vehicle was reduced by modifying the front design of the fan regulating the fan speed evaluated the change in Cd value when the passive filtration system is active.
Design Optimization of Centrifugal compressor for Automotive Turbocharger
The ultimate goal of this project is to design the centrifugal compressor to improve the surge margin for turbocharger (Passenger car application)
i. Higher trim of compressor wheel concept used.
ii. Recirculation port area introduced (Ported shroud).
Outcome and Conclusion
Compressor design with good surge margin achieved and validated with experimental results.
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6. Full Knowledge Transfer
Thermal Assessment of Storage Integrity of Dry Stored Nuclear Fuel
Objective: To assess the integrity of dry stored nuclear fuel through thermal prediction.
Approach: To do so, a 3D model has been developed with ANSYS-FLUENT 16.0 code. Due to the complex geometry of the fuel assemblies, these have been approximated as porous rectangular parallelepipeds with internal heat generation. An effective thermal conductivity and ad-hoc pressure drop have been derived. Finally, the model has been validated and verified and used in different conditions.
Simulation of experiments focused on the interaction between a vertical steam injection and a stagnant H2 rich layer in containment at a Nuclear reactor in a Severe Accident.
Results: The basic outline of the experiments modeled was an upward steam injection that, once its vertical momentum is dissipated by colliding against a flat plate, erodes a lighter gas layer consisting of He and steam (the deeper in the layer, the richer in He). The results show some similarities with measurements, but also differences.
Numerical study of Free Surface Flow based on Smoothed Particle Hydrodynamics (SPH) Method
Objective: The objective of this research is to develop a meshfree CFD solver which adapt to the flows with free surface especially large deformation of the free surface.
Approach: A parallel, multi-phase SPH code for numerical simulation of the flow field is developed. An improved boundary treatment approach based on coupled boundary approach is proposed so that the pressure of boundary particles is more accuracy and the simulation results of flow field using the improved approach are better than that of the original approach. A non-reflection boundary treatment approach is proposed. The SPH code is adopted to investigate the water entry of a solid body. The parallelized one-phase and two-phase SPH code are adopted to simulate the whole process of a wedge entering water respectively.
Results: The comparison of the numerical results of one-phase code and a two-phase code is analyzed. Finally, the computational results of two-phase code are verified by our experimental data. The different type of validation cases shows that the developed SPH code is quite robust and suitable for the simulation of the flow field with an interface or free surface.
Microchannel Solar Receiver Simulation Project
Objective: Thermal modeling and design of microchannels with circular pin fins using – STAR-CCM+.
Approach: Work involved computational modeling of coupled fluidic and heat transfer processes occurring in a unit cell of the Microchannel Solar Receiver (MSR). Conducted detailed parametric CFD study varying the geometric parameters for microchannel pin fin design to achieve maximum thermal efficiency with minimum pressure drop.
Results: Successfully developed an optimized fluidic design of unit cell design of microchannel solar receiver with circular pin fins that meets efficiency goal and pressure drop and temperature goals.
Computational Numerical Investigation of Flapping Wing
Objective: This project is part of a preliminary defense research program of China. The objective is to investigate the lift and drag force of the flapping wing.
Approach: A 3D moving grid based on the transfinite interpolation is developed which has better adaptation than the deforming grid for flapping wing. A 3D finite volume method solver is developed to adapt for the calculations of flapping wing. The effects of every flapping control parameters on the aerodynamic characteristics of flapping wing are investigated.
Results: The numerical results show that the pitching angle contributes to the average lift and will slightly decrease the thrust force as well.
Long-term Ecological, water & Sediment quality Monitoring & Numerical Modelling of the Seawaters around Singapore
Objective: This project is part of PUB seawater environment impact assessment program. The aims of this study are to quantify the impact on the environment of sewage discharge from some plant. A commercial software – MIKE by DHI – is adapted to carry out the numerical investigation.
Approach: The hydrodynamic module of MIKE is used to simulate the tidal flow in the seawaters around Singapore. The water quality module of MIKE is used to investigate the water quality in the seawaters around Singapore. The water quality parameters considered in the study are Enterococci, Faecal Coliform, Ammonia, Nitrite, Nitrate, Phosphate, Dissolved Oxygen, Chlorophyll-a, Total suspended solids.
Results: The numerical baseline results without sewage discharge are validated by the data from the monitoring station. Then the numerical results of adding sewage discharge are compared with the baseline to show the environmental impact of the discharge.
Porous Media Permeability CFD Simulations
Objective: The main objective for this is developing scripts in Python, estimate resistance values for porous media and run simulations using porous media model in PowerFLOW and find out permeability.
Approach: CFD simulations using Lattice Boltzmann based solver – PowerFLOW to analyze essential rock properties.
Results: Porous media simulations on micro CT scan images were used to accurately account for unresolved porosity.
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CFD software Customers will be provided with fully customized CFD reports which outline the Methodology, in-depth analysis, and recommendations. This insight allows our clients to optimize performance and make informed engineering decisions in a scientific, thorough manner.
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