A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
The Effect of Aliased and De-aliased Formulation for DNS Analysis in Plane Poiseuille Flow
Abstract In this research, the performance of various aliased and de-aliased schemes was studied in pseudo-spectral (PS) simulation. The PS method was used to perform aliased and de-aliased direct numerical simulation of a turbulent plane Poiseuille channel flow. The effects of aliasing errors in Navier–Stokes equations were examined for both common skew-symmetric and rotational forms. Due to boundary conditions, Fourier series in periodic directions and Chebyshev expansion in normal direction were considered. A third-order backward difference scheme was used for temporal approximation method, and different types of “2/3 rule” de-aliasing procedures in various directions were examined. The results for aliased and de-aliased formulation showed that generally, the skew-symmetric form gives the most accurate results. But de-aliased rotational form was more robust and presented fewer errors. The amount of aliasing errors for the ordinary rotation form is about two times larger than for De-aliased XYZ rotational scheme and common skew-symmetric form. From a practical point of view, the choice between the skew-symmetric form and de-aliased rotational method with the same accuracy reduces to the last one if final decision rests on the amount of computational time.
The Effect of Aliased and De-aliased Formulation for DNS Analysis in Plane Poiseuille Flow
Abstract In this research, the performance of various aliased and de-aliased schemes was studied in pseudo-spectral (PS) simulation. The PS method was used to perform aliased and de-aliased direct numerical simulation of a turbulent plane Poiseuille channel flow. The effects of aliasing errors in Navier–Stokes equations were examined for both common skew-symmetric and rotational forms. Due to boundary conditions, Fourier series in periodic directions and Chebyshev expansion in normal direction were considered. A third-order backward difference scheme was used for temporal approximation method, and different types of “2/3 rule” de-aliasing procedures in various directions were examined. The results for aliased and de-aliased formulation showed that generally, the skew-symmetric form gives the most accurate results. But de-aliased rotational form was more robust and presented fewer errors. The amount of aliasing errors for the ordinary rotation form is about two times larger than for De-aliased XYZ rotational scheme and common skew-symmetric form. From a practical point of view, the choice between the skew-symmetric form and de-aliased rotational method with the same accuracy reduces to the last one if final decision rests on the amount of computational time.
The Effect of Aliased and De-aliased Formulation for DNS Analysis in Plane Poiseuille Flow
Rajabi, Elham (author) / Kavianpour, Mohammad Reza (author)
2016-09-26
9 pages
Article (Journal)
Electronic Resource
English
High resolution reconstruction of irregularly sampled, aliased measurements
| British Library Conference Proceedings | 2009
Attenuation of aliased coherent noise: model-based attenuation for complex dispersive waves
| British Library Online Contents | 2011
Poiseuille flow in a fluid overlying a highly porous material
| British Library Online Contents | 2009
| British Library Online Contents | 2005
Numerical investigation of particle migration in poiseuille flow of composite system
| British Library Online Contents | 2004