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ADINA CFD
 

ADINA CFD provides a comprehensive approach to modeling fluids in all flow regimes and under a variety of multiphysics coupling scenarios. The program is equipped to simulate turbulent and fully compressible flows, flows with heat and mass transfer, two-phase flows, fluid-structural interactions, and fluid-electromagnetic coupling, among others.

A Comprehensive Program for Computational Fluid Dynamics Simulations

ADINA CFD provides state-of-the-art capabilities for modeling incompressible and compressible flows. ADINA CFD is capable of modeling a wide array of fluid flows, including those in the laminar and turbulent regimes, thin-film Reynolds flow with smooth or rough boundaries, two-phase flow, non-isothermal flow and conjugate heat transfer, porous-media flow, flows with mass transfer, low- and high-speed compressible conditions, and comes equipped with material models for handling non-Newtonian fluids and real gases. General flow conditions in arbitrary geometries can be solved.

 

ADINA CFD may be used as a standalone program for CFD-only analyses, or it may be used in conjunction with other modules in the ADINA product suite for multiphysics applications, such as fluid-structure interaction or fluid-electromagnetic coupling analyses.

 

An Advanced Software Package for Fluid Flow Applications

Laminar & Turbulence Modelling
 
ADINA CFD has the capability of modeling fluids in all flow regimes, including creeping flow or diffusive problems, and turbulent incompressible or fully compressible flows. The standard and RNG k-e turbulence models, Spalart-Allmaras turbulence model, and k-ε/SST turbulence model are available.
 
Aerodynamic Analysis of an Unmanned Aerial Vehicle
Thermal CFD and Stress Analysis of an Exhaust Manifold

 


Surface temperature in a conjugate heat transfer analysis of an exhaust gas manifold

 

Incompressible & Compressible Flow
 
ADINA CFD solves the full Navier-Stokes equations or the Reynolds equations for incompressible or compressible flows. Compressible flows may be slightly compressible, such as fluid contained in an enclosure, low speed compressible, where temperature coupling must be included, or high-speed compressible as with fluids experiencing a shock wave. Combining high-speed compressible flow and the capabilities of Steered Adaptive Meshing (SAM) is particularly useful for resolving shock wave propagation. Thin-film Reynolds fluid elements can be directly connected to Navier-Stokes general fluid elements to model, for example, oil reservoirs in thin-film lubrication bearings.
 
FSI Analysis of a Lighter than Air (LTA) Aircraft
Fluid-structure Interaction Analysis of Red Blood Cell
Hydraulic Engine Mount

Two-phase flow & Volume of Fluid
 
ADINA CFD supports the modeling of two-phase flow by utilizing the Volume of Fluid (VOF) feature. Immiscible or partially miscible fluids may be modeled using the surface-capturing method of the VOF interface. Cavitation can also be simulated using the VOF feature and coupled to FSI or used with turbulent flow.
 
Simulating Cavitation

Conjugate Heat Transfer & Non-Isothermal Flow
 
ADINA CFD has the capability to model heat transfer between solids and fluids and non-isothermal flow within a single program module. In conjugate heat transfer applications, the solid domain is modeled within ADINA CFD using fluid-solid elements. Here, the energy equation is solved entirely in the CFD model. In non-isothermal flow applications, particularly in situations where temperature loads induce compressibility effects, temperature is fully coupled to fluid flow. ADINA CFD allows for the investigation of various mechanisms of heat transfer – conduction, convection, and radiation – as they are coupled to fluid dynamics.
 
TFSI Analysis of a Plate-frame Heat Exchanger
Heating Effectiveness of an Industrial Furnace
Benchmarking Thermal FSI Capabilities

Rotating Geometries – Sliding Mesh
 
For models in which rotating geometries are the defining feature, such as in turbomachinery problems or stirred tanks, for example, ADINA utilizes the sliding mesh boundary condition, which permits a user to define portions of the mesh as moving relative to each other. All physical variables across the sliding mesh interface are continuous and satisfy the conservation laws. Meshes along the sliding interface may have differing subdivisions. This feature is particularly useful in Fluid-Structure Interaction problems involving one or more moving parts, but is fully applicable to fluid-only applications.
 
Analysis of a Hydraulic Turbine
Improved CFD Sliding Mesh & Gluing

Material Models
 
ADINA has several material options describing compressible and incompressible fluids. For incompressible fluids, constant, temperature-dependent, or time-dependent viscosity, heat capacity, and thermal conductivity may be assigned to a fluid. For compressible flows, temperature-, pressure-, or temperature-pressure dependent models for viscosity, heat capacity, and thermal conductivity can be used. Flows with high Mach numbers can also be simulated using the high-speed compressible flow model definitions. Non-Newtonian fluids can be described using the Power Law, temperature-dependent Power Law, and Carreau models. Additionally, ASME Steam and porous material models are available. At temperatures and pressures for which the ideal gas law is no longer valid, ADINA supports several state equations for modeling real gas behavior, including Standard Redlich-Kwong, Aungier-Redlich-Kwong, Soave-Redlich-Kwong, and Peng-Robinson. Users may also define their own materials, by use of user-coded subroutines written in Fortran.
 
New Frontiers

Cutting-Edge Meshing Capabilities for CFD Simulations
 
Meshing
 
Meshing is often viewed as an arduous, time-consuming step in the CFD modeling process. With ADINA’s advanced meshing algorithms, users can create free-form or rule-based structured meshes on arbitrarily shaped domains with ease. Meshing tools within the AUI also allow for the creation of structured boundary layer meshes, 3D swept and revolved meshes, curvature-based meshing, and automatic mesh grading.
 
In computations of fluid flow with structural interactions (FSI, or Fluid-Structure Interaction) or fluid flows with moving boundaries, it is necessary to update the mesh topology when the mesh is no longer valid due to distorted elements as a result of node movement. With the Steered Adaptive Meshing (SAM) feature in ADINA, mesh adaptation-repair procedures based on the Delaunay meshing methodology are accomplished which repair invalid elements by local remeshing. SAM may also be used to refine the mesh locally based on variable gradients, for example in areas of the domain that have steep gradients in velocity or temperature, thus offering an efficient and accurate mesh based on the simulated physics.
 


Fluid-Structure Interaction simulation of a two-dimensional gear pump
 
Steered Adaptive Meshing Applications
Adaptive Meshing in FSI
Adaptive Meshing in CFD
Meshing Tools in ADINA
 
State-of-the-Art Computational Fluid Dynamics Element Schemes

FCBI & FCBI-C Element Schemes
 
ADINA CFD offers advanced computational fluid dynamics schemes for modeling all fluid flows by use of the FCBI and FCBI-C element types. Using the FCBI, or vertex-centered, element, all coupled solution variables are solved directly in a single matrix equation. This scheme is highly stable for low Reynolds number flows, low Mach number compressible flows, and for highly nonlinear FSI problems. With FCBI-C, or cell-centered, element, solution variables are solved iteratively and stored at the cell center. FCBI-C elements are suitable for large problems (e.g., greater than 1 million DOF), as the segregated solver approach is less memory intensive, and are particularly accurate for high Reynolds number turbulent flows. The FCBI-C element is also well-suited for use with Distributed Memory Processing (DMP), making it possible to solve very large problems quickly with parallel processing.
 

Aerodynamic analysis of an Unmanned Aerial Vehicle
 
Fully Coupled FSI with ADINA DMP
 
An Integrated Program Module for Multiphysics Applications
 
Multiphysics problems are characterized by the interaction and dependency of two or more distinct physical fields (e.g., structural deformation, fluid flow, electric field, temperature, pore-pressure). One example is the study of cardiovascular mechanics, a Fluid-Structure Interaction problem, in which tissues comprising human arteries undergo highly nonlinear motions due to momentum exchange with pulsatile blood flow.
 
The ADINA Multiphysics package contains a comprehensive array of multiphysics capabilities tightly integrated in one program. Those coupled to fluid analysis include Fluid-Structure Interaction, Fluid-Electromagnetic Coupling, Fluid-Mass Transfer Coupling, and Thermal-Fluid-Structural Coupling.
 
In Fluid-Structure Interaction problems, fluids are fully coupled to general structures that can undergo highly nonlinear response due to large deformations, material nonlinearities, contact, and temperature-dependency. FSI analyses are a wide-reaching class of problems, and can be found in the automotive, biomechanics, turbomachinery, and nuclear power industries, among others.
 
In Thermal-Fluid-Structural coupling, the energy equation is solved separately in the fluid and solid domains, and the domains are coupled together by enforcing the same temperature and heat flux at the fluid-structure interface. A chief advantage of this method, is that heat generation in the solid model (i.e., due to frictional heating, plastic deformation, or viscous effects) affects the temperature field of the fluid model.
 
In Fluid-Mass Transfer coupling, the fluid flow is coupled to species transport, thus the species concentration affects the fluid flow profile, and vice versa. The coupling is due to the dependence of the mixture’s density and viscosity on the solute concentration. Transfer of the solute due to the flow changes the spatial distribution of the mixture density and also its viscosity, consequently affecting the flow pattern, which in turn affects the movement of the solute.
 
In problems concerning the coupling of fluids to electromagnetic phenomena, ADINA solves the general Maxwell’s equations coupled to fluid flow characterized by the Navier-Stokes equations. In this class of multiphysics problems, the fluid flow is driven by the Lorentz forces caused by the electromagnetic field. A common example of this coupled behavior is in microwave heating of food products.
 

Thermal-Fluid-Structural Analysis of a Shell and Tube Heat Exchanger

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