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Numerical Heat Transfer And Fluid Flow

Numerical simulation of laminar flow past a circular cylinder

http://publications.lib.chalmers.se/records/fulltext/180053/local_180053.pdf

Quantitative numerical analysis of flow past a circular cylinder at Reynolds number between 50 and 200

The immersed boundary method is a methodology for dealing with boundary conditions at fluid–fluid and fluid–solid interfaces. The immersed boundary method has been attracting growing attention in t...

https://journals.sagepub.com/doi/pdf/10.1177/0954406219842606

Recent trends and progress in the immersed boundary method

Finding accurate solutions to partial differential equations (PDEs) is a crucial task in all scientific and engineering disciplines. It has recently been shown that machine learning methods can improve the solution accuracy by correcting for effects not captured by the discretized PDE. We target the problem of reducing numerical errors of iterative PDE solvers and compare different learning approaches for finding complex correction functions. We find that previously used learning approaches are significantly outperformed by methods that integrate the solver into the training loop and thereby allow the model to interact with the PDE during training. This provides the model with realistic input distributions that take previous corrections into account, yielding improvements in accuracy with stable rollouts of several hundred recurrent evaluation steps and surpassing even tailored supervised variants. We highlight the performance of the differentiable physics networks for a wide variety of PDEs, from non-linear advection-diffusion systems to three-dimensional Navier-Stokes flows.

Solver-in-the-Loop: Learning from Differentiable Physics to Interact with Iterative PDE-Solvers

Transitional flow past a circular cylinder in the lower subcritical regime (Re = 3900) has been analysed using Large Eddy Simulation (LES) coupled to Smagorinsky and dynamic sub grid scale models. These simulations have been carried out using a parallel multiblock structured finite volume code which is based on SIMPLE algorithm. The predictions are validated against detailed measurement data for mean as well as turbulence quantities. The present LES prediction in general agree reasonably well with the measurement data in the near wake region but deviates from the measurement data in the far wake region which may be due to the coarse resolution of the grid in this region. The influence of the SGS model on mean flow quantities as well as on the flow structures are also discussed.

LES of Flow past Circular Cylinder at Re = 3900

Turbulent flow past circular cylinder at moderate to high Reynolds number has been analysed employing an
second-order time accurate pressure-based finite volume method solving two-dimensional Unsteady Reynolds
Averaged Navier Stokes (URANS) equations for incompressible flow, coupled to eddy-viscosity based turbulence
models. The major focus of the paper is to test the capabilities and limitations of the present turbulence
model-based 2D URANS procedure to predict the phenomenon of Drag Crisis, usually manifested in reliable measurement data, as a sharp drop in the mean drag coefficient around a critical Reynolds number. The computation results are compared to corresponding measurement data for instantaneous aerodynamic coefficients and mean surface pressure and skin friction coefficients. Turbulence model-based URANS computations are in general found to be inadequate for correct prediction of the mean drag coefficients, the Strouhal number and also the coefficients of maximum fluctuating lift over the range of flow Reynolds number varying from 104 to 107.

https://jafmonline.net/JournalArchive/download?file_ID=15330&issue_ID=207

On the Reliability of Eddy Viscosity Based Turbulence Models in Predicting Turbulent Flow past a Circular Cylinder Using URANS Approach

The present work aims at calculation of 2D laminar flow past a circular cylinder at Reynolds numbers varying from 50 to 5000 using an implicit pressure-based finite13; volume type Navier Stokes code for unsteady incompressible flow. The flow solution algorithm employs non-orthogonal boundary-fitted curvilinear grid with collocated variable arrangement coupled to low diffusive second order accurate schemes for discretisation of the non-linear convective fluxes and 2nd order accurate temporal discretisation schemes. The predictor-corrector type solution strategy of the SIMPLE algorithm is used with appropriate odifications for collocated variable arrangement. The computational results for mean surface pressure, skin friction, separation points,instantaneous streamlines and the temporal variation of the aerodynamic coefficients like13; lift and drag are validated against measurement and other computational data for both steady and periodic vortex shedding situations.

Laminar flow past a circular cylinder at reynolds number varying from 50 to 5000

Turbulent flow simulation past low aspect ratio (AR) thin wings used for two different MAV (Micro Air Vehicle) configurations viz Black Kite and Golden Hawk have been carried out in order to analyze their aerodynamic characteristics The Reynolds number for these two wings based on the root chord are 24 × 105 and 17 × 105 respectively These simulations have been carried out using the in-house flow solution code to solve the Unsteady Reynolds Averaged Navier Stokes (URANS) equations coupled to different turbulence models The standard k-e model has been used to predict the turbulent flow past the Black Kite wing The influence of three different turbulence models (standard k-e, SA and SST) in predicting the aerodynamic coefficient has been studied for the Golden Hawk wing In the present study the aerodynamic characteristics computed for the two wing configurations are compared with the CSIR-NAL experiments The cross flow patterns and the tip vortex for the Golden Hawk wing are presented and discussed

/pdf/cfd-simulation-of-flow-past-mav-wings-4mjs9czlyk.pdf

BN Rajani

Papers

Numerical simulation of laminar flow past a circular cylinder

LES of Flow past Circular Cylinder at Re = 3900

On the Reliability of Eddy Viscosity Based Turbulence Models in Predicting Turbulent Flow past a Circular Cylinder Using URANS Approach

Laminar flow past a circular cylinder at reynolds number varying from 50 to 5000

CFD Simulation of Flow Past MAV Wings