Unstable particles rarely feature in conjunction with integrability 1+1D quantum field theory. However, the family of homogenous sine-Gordon models provides a rare example where both stable and unstable bound states are present spectrum whilst scattering matrix is diagonal solves usual bootstrap equations. In standard picture, result from complex poles $S$-matrix located unphysical sheet rapidi...

A new approach to particle simulation, called “quiet direct simulation Monte Carlo” (QDSMC) , is described that can be applied to many problems of interest, including hydrodynamics, MHD simulation and the,modeling of plasmas with arbitrary and arbitrarily varying collisionality. The essence of QDSMC ’ is the use of carefully chosen weights for the particles (e.g., Gauss-Hermite, for Maxwellian ...

In this Letter, we present a new self-consistent theory for the production of the relativistic outflows observed from radio-loud black hole candidates and active galaxies as a result of particle acceleration in hot, viscous accretion disks containing standing, centrifugally supported isothermal shocks. This is the first work to obtain the structure of such disks for a relatively large value of ...

Smoothed particle hydrodynamics is a completely mesh-free method to simulate fluid flow. Rather than representing the physical variables on a fixed grid, the fluid is represented by freely moving interpolation centers (”particles”). Apart from their position and velocity these particles carry information about the physical quantities of the considered fluid, such as temperature, composition, ch...

Smoothed Particle Hydrodynamics SPH is a meshless Lagrangian parti cle method for solving a system of hydrodynamic equations for compressible uids SPH is especially suited for problems with free boundaries a commonplace situation in as trophysics Rather than solving the equations on a grid the equations are solved at the positions of the so called particles each representing a mass packet with ...

W ithin this thesis, the Computational Fluid Dynamics method Smoothed Particle Hydrodynamics (SPH) is applied to simulate bubble induced mixing in wastewater treatment plants for the first time. To do so, a new SPH multiphase algorithm is presented that is especially designed to be very cheap in terms of computational costs and solves the problem that air bubbles are only stable for a short tim...

Modelling aerated flows is a complex application of computational fluid dynamics (CFD) since the interfaces between air and water change rapidly. In this work, the simulation of aerated flows with the smoothed particle hydrodynamics (SPH) method is investigated with a focus towards the application in engineering practice. To prove the accuracy of the method, the processes of air entrainment and...

Smoothed Particle Hydrodynamics is a multidimensional Lagrangian method of numerical hydrodynamics that has been used to tackle a wide variety of problems in astrophysics. Here we develop the basic equations of the SPH scheme, and we discuss some of its numerical properties and limitations. As an illustration of typical astrophysical applications, we discuss recent calculations of stellar inter...

Water simulation and water effects are nowadays an evolving field. In recent years we have seen a big advance in fluid simulations. In this paper we present a method for flood simulations of cities and complex models. SPH method is used for the fluid simulation by which we gain less expensive computation than by using other known methods of simulation. Because of complex models, collision handl...