Accession Number : AD1011188


Title :   Investigation of the Vehicle Mobility in Fording


Descriptive Note : Conference Paper


Corporate Author : US ARMY TARDEC WARREN United States


Personal Author(s) : Pazouki,Arman ; Jayakumar,Paramsothy ; Negrut,Dan


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1011188.pdf


Report Date : 29 May 2016


Pagination or Media Count : 2


Abstract : This contribution concerns a general purpose fluid-multibody system (MBS) simulation framework that can be used to analyze the fluid-solid, two-way coupled dynamics at low to medium Reynolds numbers (0 Re 1500). The simulation framework can be leveraged to investigate MBS applications that include (i) rigid and flexible bodies of arbitrary geometry; (ii) bilateral constraints (joints); (iii) unilateral constraints associated with impact and contact phenomena; and (iv) friction/cohesion.The fluid dynamics problem is formulated using the fluid momentum and continuity, i.e., Navier-Stokes equations. These equations are spatially discretized via a weakly compressible smoothed particle hydrodynamics (SPH) Lagrangian method [1], which relies on moving markers to store state information associated with fluid phase. The space dependent variables, such as velocity and pressure, are smoothed out locally via a scalar function. That is, to obtain a variable, a gradient, or a hydrodynamics force at an arbitrary location of the domain, one needs to account for partial contributions coming from nearby markers. External forces such as fluid-solid interaction (FSI) force are added to the hydrodynamics force. The fluid equations of motion, which upon spatial discretization become a set of ordinary differential equations, are solved explicitly using a second order Runge-Kutta integration method.Of several approaches that have been considered in the literature to model the fluid-solid coupling, we show that using a point-cloud discretization of a solid results in an accurate calculation of the fluid-solid coupling forces [2]. In this approach, the MBS dynamics is solved by providing the solver with distributed forces captured by the point cloud representation.


Descriptors :   Fording , Mobility , fluid dynamics , Reynolds number , friction , Navier Stokes equations , hydrodynamics , coupling (interaction) , Equations of motion , differential equations , models , computerized simulation , parallel processing


Distribution Statement : APPROVED FOR PUBLIC RELEASE