A Coupled DSMC/Navier-Stokes Method for Multiscale Analysis of Gas Flow in Microfluidic Systems
نویسندگان
چکیده
A multiscale method that couples direct simulation Monte Carlo (DSMC) method with Navier-Stokes equations is presented. The multiscale method is based on the Schwarz coupling of the DSMC and Navier-Stokes subdomains. Dirichlet boundary conditions are used at the coupling interfaces. The Navier-Stokes equations are solved using a scattered point based finite cloud method. Data interpolation between Navier-Stokes and DSMC subdomains is also achieved using a scattered point interpolation scheme. With the present method, multiscale problems that exhibit compressibility in the continuum subdomains can be simulated. As an example, a microfilter is simulated using the multiscale method, and it is shown that the interface can be positioned in a region exhibiting velocity, pressure, and temperature gradients. As compared to a multiscale analysis of the same problem using DSMC/Stokes coupling [8], the present method achieves a larger reduction in computation time. Detailed comparison of the multiscale solution with the DSMC results is presented.
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