J-OCTA VSOP - PS for Multiphase Material Modelling and Simulation at Meso Scale
Particle-based Fluid, Heat Transfer, and Powder Calculation Engine for Composite Process Design
VSOP-PS is a computational fluid dynamics simulation engine based on the particle method (MPS = Moving Particle Simulation/Semi-Implicit method). The particle method is a simulation method that has strength in its robustness for simulating large deformation. In recent years, the particle method has been applied not only in basic research but also in industrial fields, and many examples can be seen in the automotive, transportation equipment, civil engineering, and construction fields. However, there have not been many applications to materials development on a small scale, such as slurries, which are problems in the battery electrode process, and composite resin materials. Therefore, VSOP-PS, a particle-based mesoscale material process simulation engine, has been developed for developers of battery electrodes, cosmetics, composite resin materials, powder materials, and their manufacturing processes. VSOP-PS analysis covers a spatial scale of tens of nanometers to tens of micrometers and a time scale of micro to milliseconds. Furthermore, VSOP-PS is characterized by its ability to evaluate filler volume fractions, their shapes, and filler-filler interactions.
J-OCTA RVE modeler is required to create VSOP-PS models.
#VSOP-PS-Case study
Viscosity Evaluation: lubricating oil, Cosmetics, etc
Particle dispersion: Ink, etc.
Droplet evaporation/Coffee ring: Inkjet printer, etc.
Powder compression (DEM method) : Battery electrode, etc.
[Analysis Example] Calculation of pressure and porosity in the forming process (calendaring) of battery electrodes
Thermal conductivity : Semiconductor sealing and etc.
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Impregnation : CFRP and etc.
Read this case study.
Fluid analysis of filler dispersion systems using the particle method (MPS).
Objectives and Methods
Solid particles (fillers) with sizes of around 1 μm dispersed in a liquid are called suspensions, and the evaluation of their physical properties and analysis of their mechanisms are important in many industrial fields, such as inks and battery electrodes. Here, we introduce examples of viscosity evaluation.
VSOP-PS, one of the engines of J-OCTA, uses the particle method (MPS = Moving Particle Simulation (or Semi-Implicit) method) to solve the Navier-Stokes equations, the basis of fluid dynamics. It is possible to compute solid particles in a fluid, and two models can be selected. We refer to the left side of Figure 1 as the micro model and the right side as the meso model. In the micro model, one solid particulate is modeled as “multiple yellow spheres” connected together. In the meso model, one solid particle is represented by “one yellow sphere”. The micro model can model complex solid particle shapes. On the other hand, solid particles in the meso model are more coarse-grained, resulting in the ability to calculate systems containing many solid particles.
Results
Figure 2 shows the relationship between the volume fraction of solid particles and the viscosity of the suspension.
Except for VSOP-PS (meso model and micro model), the other curves are based on well-known models, respectively.
The two VSOP-PS results are close to the Thomas model, which is often referenced in the high concentration range.
For solid particulate dispersion systems in liquids, the free version of OCTA already includes KAPSEL, which is based on the Smoothed Profile Method and provides highly accurate simulations of various phenomena in suspensions. On the other hand, VSOP-PS is being developed to target a wide range of phenomena such as droplet and evaporation phenomena, flow field in porous media, thermal coupling, etc., by taking advantage of the particle method. VSOP-PS and KAPSEL can be used separately for each target.
If you are interested in VSOP-PS, please contact us.
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