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CFD.NINJA is a group founded in 2014, since then we have been dedicated to the research and dissemination of topics related to Computational Fluid Dynamics (CFD) for which we use various CFD simulation software such as ANSYS FLUENT, ANSYS CFX, ANSYS MESHING, ANSYS ICEM CFD, OpenFoam, DesignModeler, SpaceClaim, Rocky DEM, Autodesk Inventor, Ensight, etc.
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More than 150 Free Tutorials using Ansys Fluent, Ansys CFX, Ansys Meshing, DesignModeler, SpaceClaim, Autodesk Inventor, ICEM CFD.

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CFD.NINJA Tutorials

We have a large number of tutorials that we have developed over several years and we make them available to you. In many of them, you can download files, geometries, and meshes. Soon we will be uploading more tutorials for experts and beginners of ANSYS CFD. We hope you can share this website with your friends and colleagues.

Source: Ansys
Computational fluid dynamics (CFD) is a tool with amazing flexibility, accuracy and breadth of application. But serious CFD, the kind that provides insights to help you optimize your designs, can be out of reach unless you choose your software carefully. To get serious CFD results, you need serious software. Ansys CFD goes beyond qualitative results to deliver accurate quantitative predictions of fluid interactions and trade-offs. These insights reveal unexpected opportunities for your product — opportunities that even experienced engineering analysts can miss.

Ansys Fluent Tutorials

Source: Ansys

Fluent software contains the broad, physical modeling capabilities needed to model flow, turbulence, heat transfer and reactions for industrial applications. These range from air flow over an aircraft wing to combustion in a furnace, from bubble columns to oil platforms, from blood flow to semiconductor manufacturing and from clean room design to wastewater treatment plants. Fluent spans an expansive range, including special models, with capabilities to model in-cylinder combustion, aero-acoustics, turbomachinery and multiphase systems.

Ansys Fluent – How to add new material?

By default, your local materials list will include a single fluid material (air) and a single solid material (aluminum). If the fluid involved in your problem is air, you can use the default properties for air or modify the properties.

Ansys Fluent – Axial Fan

An axial fan is a type of fan that causes gas to flow through it in an axial direction, parallel to the shaft about which the blades rotate. The flow is axial at entry and exit. The fan is designed to produce a pressure difference, and hence force, to cause a flow...

Ansys Fluent Tutorial | Melting

In this tutorial you will learn how to simulate a melting case using Ansys Fluent. You can do this tutorial with Ansys student version.

Ansys Fluent | Blower | Mesh Motion (Unsteady)

In this tutorial, you will learn how to simulate a blower (unsteady) using Mesh Motion with Ansys Fluent. Please download the mesh.

Ansys Fluent Tutorial | Melting

Ansys Fluent Tutorial | Melting

Source: Ansys If you are including melting or solidification in your VOF calculation, note the following: It is possible to model melting or solidification in a single phase or in multiple phases. For phases that are not melting or solidifying, you must set the latent...

Ansys CFX Tutorials

Source: Ansys

Ansys CFX is a high-performance computational fluid dynamics (CFD) software tool that delivers reliable and accurate solutions quickly and robustly across a wide range of CFD and multiphysics applications. CFX is recognized for its outstanding accuracy, robustness and speed when simulating turbomachinery, such as pumps, fans, compressors and gas and hydraulic turbines.


OpenFOAM is the free, open source CFD software developed primarily by OpenCFD Ltd since 2004. It has a large user base across most areas of engineering and science, from both commercial and academic organisations.

Ansys CFX – Porous Medium

A porous medium is a solid with voids distributed more or less uniformly throughout the bulk of the body.

The basic characteristic of this medium is porosity. The bulk porosity Π of a material is defined as the ratio of void volume Vv to body volume V0, Π = Vv/V0. Since the remaining portion Vs of the total volume of the material is in the form of a solid “skeleton”, then

Ansys CFX – Heat Transfer Fluid/Solid

Heat transfer is the process of transfer of heat from high temperature reservoir to low temperature reservoir. In terms of the thermodynamic system, heat transfer is the movement of heat across the boundary of the system due to temperature difference between the system and the surroundings.

Ansys CFX – How to add new material?

By default, your local materials list will include a single fluid material (air) and a single solid material (aluminum). If the fluid involved in your problem is air, you can use the default properties for air or modify the properties.

Ansys CFX – Compressible Flow

Ansys CFX – Compressible Flow

Source: Ansys Compressibility effects are encountered in gas flows at high velocity and/or in which there are large pressure variations. When the flow velocity approaches or exceeds the speed of sound of the gas or when the pressure change in the system ( ) is large,...

Ansys CFX – Heat Transfer through a Pipe

Ansys CFX – Heat Transfer through a Pipe

Source: NASA Thermodynamics is a branch of physics that deals with the energy and work of a system. Thermodynamics deals only with the large scale response of a system that we can observe and measure in experiments. In aerodynamics, we are most interested in the...

Ansys Meshing Tutorials

Source: Ansys

Meshing is an integral part of the engineering simulation process where complex geometries are divided into simple elements that can be used as discrete local approximations of the larger domain. The mesh influences the accuracy, convergence and speed of the simulation. Furthermore, since meshing typically consumes a significant portion of the time it takes to get simulation results, the better and more automated the meshing tools, the faster and more accurate the solution.

Ansys provides general purpose, high-performance, automated, intelligent meshing software which produces the most appropriate mesh for accurate, efficient multiphysics solutions — from easy, automatic meshing to highly crafted mesh. Methods available cover the meshing spectrum of high-order to linear elements and fast tetrahedral and polyhedral to high-quality hexahedral and Mosaic. Smart defaults are built into the software to make meshing a painless and intuitive task delivering the required resolution to capture solution gradients properly for dependable results.

Ansys Meshing – Multizone + Inflation

The MultiZone mesh method provides automatic decomposition of geometry into mapped (sweepable) regions and free regions. When the MultiZone mesh method is selected, all regions are meshed with a pure hexahedral mesh if possible.

Ansys Meshing – Local Sizing

The Sizing options provide greater control over the following properties:
Mesh growth (transition) between small and large sizes based on a specified growth rate

Ansys Meshing – Bias Factor

Source: Ansys Bias Type and Bias Option For edges only, use Bias Type to adjust the spacing ratio of nodes on an edge. This feature is useful for any engineering problem where nodes need to be clustered on an edge or group of edges, or if there is a need to bias the...

Ansys Meshing – Hexahedral Mesh

The MultiZone mesh method provides automatic decomposition of geometry into mapped (structured/sweepable) regions and free (unstructured) regions. It automatically generates a pure hexahedral mesh where possible and then fills the more difficult to capture regions with unstructured mesh.

Ansys Meshing – Body of Influence

Ansys Meshing – Body of Influence

Source: Ansys The Body of Influence option is available in the Type field if you selected a body and Use Adaptive Sizing is set to No. Using this option, you can set one body as a source of another body (that is, a Body of Influence). The Body of Influence will...

Ansys Meshing – Sphere of Influence

Ansys Meshing – Sphere of Influence

Source: Ansys The Sphere of Influence option is available in the Type field after you select an entity such as a body, face, edge, or vertex. If the Sphere of Influence is scoped to a body or vertex, the Sphere of Influence affects the entire body regardless of sizing...

Ansys Meshing – Sizing

Ansys Meshing – Sizing

Source: Ansys The Sizing options provide greater control over the following properties: Mesh growth (transition) between small and large sizes based on a specified growth rate Curvature based refinement and angles between normals for adjacent mesh elements...

Ansys DesignModeler Tutorials

Ansys DesignModeler – Analysis Tools

The analysis tools consist of a set of functions which allow you to measure the distance between any two entities, obtain model entity information, and detect model faults. The function supports:

Ansys DesignModeler – Manipulating Autodesk Inventor Geometry

The ANSYS DesignModeler application is designed to be used as a geometry editor of existing CAD models.

Ansys DesignModeler – Slice

The Slice feature improves the usability of ANSYS DesignModeler as a tool to produce sweepable bodies for hex meshing and to assign different cross sections in a line body.

Ansys DesignModeler – Projection vs Imprint Face

The Projection feature allows you to project points on edges/faces and edges on faces/bodies. This feature can be executed on both frozen and active bodies.

Ansys DesignModeler – Thin/Surface

Ansys DesignModeler – Thin/Surface

Source: Ansys he Thin/Surface feature has two distinct applications: Create thin solids Simplified shelling The three selection tools are: Faces to Remove: selected faces will be removed from their bodies. Faces to Keep: selected faces will be kept, while unselected...

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