Abstract To verify the operational feasibility of plate-and-tube evaporative cooling frost-free heat pump exchanger and its influence factors, a single was selected as simulation object, VOF model, RNG k-ε self-programmed UDF program were used to control water vapor transfer mass air flow rate on internal law model. The results show that velocity increases, percentage turbulent inside model sol...

This note outlines how the coupling between the motion of rigid bodies immersed in a fluid and the motion of this fluid is handled in XNS. For a rigid body one has a group of nodes which define the surface of the rigid body called “reference node group” (RNG). For each RNG we save the properties of motion in arrays which in the following we will call “RNG arrays”. They contain the bottom and to...

In this study, the aerodynamic analysis of Ahmed body which is generic automobile model performed to determine convenient turbulence and reduce drag coefficient by modifying shape model. For purpose, Computational Fluid Dynamics (CFD) carried out using different models that are Spalart-Allmaras, (Shear Stress Transport) SST k-ω, Standard k-ε, Realizable (Re-Normalisation Group) RNG k-ε models. ...

In this paper which is an extended version of an article submitted to the Finite Volumes for Complex Applications V conference, we design a finite-volume based numerical scheme for the solution of the nonlinear balance equations of RNG variants of the well-known k − ε model and the v − f system encountered in the k − ε− v − f model which can be seen as an extension of first order turbulence mod...

Using the CFD model, a new ventilation system design will be found later taking into consideration the ventilation efficiency such as uniformity, stability, and suitability of environmental factors in a naturally ventilated broiler house. Because conducting a field experiment for the ventilation study presented so many difficulties, a reliable 3-dimentional computational fluid dynamics (CFD) mo...

The spacer grid has a significant impact on the thermal-hydraulic characteristics of rod bundle channel, which directly determines possibility boiling crisis. multi-phase flow model coupling is proposed to acquire secondary and void fraction for subcooled in fuel assembly. Compared with experimental data, RNG k–ε turbulence selected current research. In addition, parameters 5 × are studied focu...