IMPROVEMENT OF THE SPARSE MATRICES STORAGE ROUTINES FOR LARGE FEM CALCULATIONS
Efficient memory handling is one of the key issues that engineers and programmers face in developing software for numerical analysis such as the Finite Element Method. This method operates on huge matrices that have a large number of zero coefficients which waste memory, so it is necessary to save it and to work only with non-zero coefficients usin...
By Dragoljub Stevanović, Marko Topalović, Miroslav Živković
SORET AND VARIABLE THERMAL CONDUCTIVITY EFFECTS ON HYDRO-MAGNETIC RADIATING FLUID PAST A VERTICAL PLATE WITH POROUS MEDIUM
Thermal diffusion and variable thermal conductivity effects on unsteady magnetohydrodynamic (MHD), heat and mass transfer flow past an infinite vertical porous plate have been investigated and analyzed numerically. The resultant flow governing equations are resolved numerically by the finite-difference scheme of the Crank-Nicolson type implicit met...
By M. Santha Raju, G.S.S. Raju
HEAT TRANSFER TO A BOILING LIQUID – NUMERICAL STUDY
Due to extensive research efforts within the past thirty years, the mechanisms by which bubbles transfer energy during pool boiling are relatively well understood and have various applications in reactors, rockets, distillation, air separation, refrigeration and power cycles. In this paper, CFD analysis of heat transfer characteristics in nucleate ...
By Andrijana Stojanović, Srđan Belošević, Nenad Crnomarković, Ivan Tomanović, Aleksandar Milićević
CORONARY ATHEROSCLEROSIS ASSESSMENT: A NEW ANATOMICAL, FUNCTIONAL, MORPHOLOGICAL AND BIO-MECHANICAL APPROACH
The aims of this work are to investigate and compare two different flow dynamics techniques (steady state - pulsatile flow) for endothelial shear stress calculation, compare lesion specific smartFFR and ESS values, as well as total vessel smartFFR and ESS values, and investigate the relationship between smartFFR and ESS to stress MBF (myocardial bl...
By Panagiotis K. Siogkas, Georgios-Eleftherios Kalykakis, Constantinos D. Anagnostopoulos, Themis P. Exarchos
PHYSICS-INFORMED NEURAL NETWORKS FOR ELASTIC PLATE PROBLEMS WITH BENDING AND WINKLER-TYPE CONTACT EFFECTS
Kirchhoff plate bending and Winkler-type contact problems with different boundary conditions are solved with the use of physics-informed neural networks (PINN). The PINN is built on the base of mechanics laws and deep learning. The idea of the technique includes fitting the governing partial differential equations at collocation points and then tra...
By Aliki D. Muradova, Georgios E. Stavroulakis
ON DIFFUSE INSTABILITY OF ORTHOTROPIC VISCOPLASTIC PLATES
Elastic strain is covered by the effective medium homogenization method inside a representative volume element (RVE). It has an incremental quasi rate-independent (QRI) form obtained by the endochronic concept of thermodynamic time. The rate dependence takes place by means of stress rate dependent value of the initial yield stress. Free meso rotati...
By Ljudmila T. Kudrjavčeva, Milan V. Mićunović
MANUFACTURING OF RAPID PROTOTYPES OF MECHANICAL PARTS USING REVERSE ENGINEERING AND 3D PRINTING
This article focuses on the design and manufacture of mechanical parts that have complicated shapes using the technique of reverse design using a scanner or an MMT for data acquisition in the form of a point cloud, using CAD software (CATIA). The digital model created is used for a virtual representation of the final product. Then we get the physic...
By Salah Amroune, Ahmed Belaadi, Moussa Menaseri, Noureddine Geroski, Barhm Mohamad, Khalissa Saada, Riyad Benyettou
ENHANCED DAMPING CHARACTERISTICS OF TIMOSHENKO BEAM ON ELASTIC AND METAMATERIAL FOUNDATIONS
An analytical model is developed for the flexural wave propagation of a continuous Timoshenko beam resting on elastic and metamaterial foundations. The metamaterial foundation consists of positive and negative springs with a damper. This added negative stiffness component is constructed in such a way to provide the same static stiffness and the sam...
By A. O. Oyelade, O. M. Sadiq
DO EQUOL’S C-RING HYDROGENS CONTRIBUTE TO FREE RADICAL SCAVENGING?
Free radical scavenging potency of physiologically active equol molecule, derived by gut microbiota from soy isoflavone daidzein, was investigated by using M06-2X/6-311++G(d,p) level of theory, accompanied with the TST and Eckart tunneling corrections for the estimation of rate constants. Phenolic hydrogens of equol are recognized as much more abst...
By Ana Amić, Dejan Milenković, Jasmina Dimitrić Marković, Zoran Marković
EFFECT OF SURFACE ROUGHNESS ON CHARACTERISTICS OF MAGNETIC FLUID BASED SQUEEZE FILM BETWEEN POROUS CIRCULAR PLATES
The effect of surface roughness on characteristics of magnetic fluid based squeeze film between porous circular plates is hypothetically analysed. The pressure distribution is obtained by solving concern Reynolds type equation with suitable boundary conditions and the result is utilized to obtain load carrying capacity. It is concluded that the loa...
By P. L. Thakkar, H. C. Patel