SIERRA/Premo-A New General Purpose Compressible Flow Simulation Code

2002 ◽  
Author(s):  
Thomas Smith ◽  
Curtis Ober ◽  
Alfred Lorber
Keyword(s):  
Compressible Flow ◽  
Flow Simulation ◽  
General Purpose ◽  
Simulation Code

Implementation of a Compressible-Flow Simulation Code in the D Programming Language

2016 ◽  
Vol 846 ◽  
pp. 54-60 ◽  
Author(s):  
Peter Jacobs ◽  
Rowan Gollan
Keyword(s):  
Compressible Flow ◽  
Programming Language ◽  
Flow Simulation ◽  
Scientific Software ◽  
Simulation Code ◽  
Flow Solver ◽  
User Input

We describe the formulation and implementation of the Eilmer4 compressible-flow solver as well as discuss the features of the D programming language that we have found useful for writing scientific software. An example of use is provided to show the features of the user-input scripting and the performance of the main simulation code when run in parallel with block-marching.

scholarly journals Implicit gradient reconstruction (IGR) method for compressible flow simulation

2017 ◽  
Vol 822 ◽  
pp. 012030
Author(s):  
Manish K Singh ◽  
N Munikrishna ◽  
V Ramesh ◽  
N Balakrishnan
Keyword(s):  
Compressible Flow ◽  
Flow Simulation ◽  
Gradient Reconstruction

scholarly journals A general-purpose time-step criterion for simulations with gravity

2020 ◽  
Vol 495 (4) ◽  
pp. 4306-4313 ◽  
Author(s):  
Michael Y Grudić ◽  
Philip F Hopkins
Keyword(s):  
Time Scale ◽  
General Purpose ◽  
Gravitational Acceleration ◽  
Time Step ◽  
Simulation Code ◽  
Time Stepping ◽  
Dynamical Time ◽  
Adaptive Time Step ◽  
Order Of Magnitude ◽  
True Time

ABSTRACT We describe a new adaptive time-step criterion for integrating gravitational motion, which uses the tidal tensor to estimate the local dynamical time-scale and scales the time-step proportionally. This provides a better candidate for a truly general-purpose gravitational time-step criterion than the usual prescription derived from the gravitational acceleration, which does not respect the equivalence principle, breaks down when $\boldsymbol {a}=0$, and does not obey the same dimensional scaling as the true time-scale of orbital motion. We implement the tidal time-step criterion in the simulation code gizmo, and examine controlled tests of collisionless galaxy and star cluster models, as well as galaxy merger simulations. The tidal criterion estimates the dynamical time faithfully, and generally provides a more efficient time-stepping scheme compared to an acceleration criterion. Specifically, the tidal criterion achieves order-of-magnitude smaller energy errors for the same number of force evaluations in potentials with inner profiles shallower than ρ ∝ r−1 (i.e. where $\boldsymbol {a}\rightarrow 0$), such as star clusters and cored galaxies. For a given problem these advantages must be weighed against the additional overhead of computing the tidal tensor on-the-fly, but in many cases this overhead is small.

scholarly journals An efficient targeted ENO scheme with local adaptive dissipation for compressible flow simulation

2021 ◽  
Vol 425 ◽  
pp. 109902
Author(s):  
Jun Peng ◽  
Shengping Liu ◽  
Shiyao Li ◽  
Ke Zhang ◽  
Yiqing Shen
Keyword(s):  
Compressible Flow ◽  
Flow Simulation ◽  
Eno Scheme

A General Purpose Formulation for Nonsmooth Dynamics With Finite Rotations: Application to the Woodpecker Toy

2020 ◽  
Vol 16 (3) ◽  
Author(s):  
Alejandro Cosimo ◽  
Federico J. Cavalieri ◽  
Javier Galvez ◽  
Alberto Cardona ◽  
Olivier Brüls
Keyword(s):  
Finite Element ◽  
Multibody Dynamics ◽  
Equations Of Motion ◽  
Horizontal Displacement ◽  
General Purpose ◽  
Nonsmooth Dynamics ◽  
Unilateral Constraints ◽  
Simulation Code ◽  
Frictional Contacts ◽  
Large Rotations

Abstract The aim of this work is to extend the finite element multibody dynamics approach to problems involving frictional contacts and impacts. The nonsmooth generalized-α (NSGA) scheme is adopted, which imposes bilateral and unilateral constraints both at position and velocity levels avoiding drift phenomena. This scheme can be implemented in a general purpose simulation code with limited modifications of pre-existing elements. The study of the woodpecker toy dynamics sets up a good example to show the capabilities of the NSGA scheme within the context of a general finite element framework. This example has already been studied by many authors who generally adopted a model with a minimal set of coordinates and small rotations. It is shown that good results are obtained using a general purpose finite element code for multibody dynamics, in which the equations of motion are assembled automatically and large rotations are easily taken into account. In addition, comparing results between different models of the woodpecker toy, the importance of modeling large rotations and the horizontal displacement of the woodpecker's sleeve is emphasized.

Quasi-Three-Dimensional Compressor Performance Simulation Using Streamline Curvature and Multi-Parallel Compressor Theory

2006 ◽  
Author(s):  
Ioannis Templalexis ◽  
Pericles Pilidis ◽  
Vassilios Pachidis ◽  
Petros Kotsiopoulos
Keyword(s):  
Total Pressure ◽  
Three Dimensional ◽  
Flow Simulation ◽  
Radial Pressure ◽  
Simulation Code ◽  
Simulation Tools ◽  
Radial Distortion ◽  
Streamline Curvature ◽  
Compressor Performance ◽  
The Impact

Engine inlet distortion can severely affect compressor performance by causing the non-dimensional speed lines and surge line to shift. This paper discusses a highly integrated method for modelling engine inlet total pressure distortion and predicting compressor performance under these conditions. This study utilizes a three dimensional (3D), computational fluid dynamics (CFD) tool, based on vortex lattice theory, to simulate the development of distorted flow within the intake and to establish the boundary conditions at the compressor’s inlet face. The derived 3D pressure distributions at the intake outlet are subsequently decomposed into circumferential and radial pressure profiles. Circumferential and radial distortions are examined separately. The influence of the first profile type on compressor performance is assessed with the support of a multi-parallel compressor calculation procedure. The impact of the radial distortion profile is assessed by using a two-dimensional (2D) streamline curvature (SLC) software. Concerning the radial distortion, several distributions are examined along with various profile types. The circumferential total pressure distortion patterns addressed, are varied with respect to the spoiled sector extend and the absolute value in total pressure difference. More precisely, three spoiled sector angles of 60, 120 and 180 degrees are examined. This work demonstrates the applicability of the method by using a generic intake model fitted in front of a single stage compressor, as a case study. All the individual simulation tools, namely the intake flow simulation code, the SLC code and the multi-parallel compressor code, are briefly presented in this paper with more focus on the SLC software, which has not been published before. All simulation tools, used by this study, have been validated individually in the past against experimental data. Their combined operation however, as a unified simulation package, has not been validated yet and hence, numerical results presented in this study should be taken qualitative.

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