Today I would like to show you how easy it is to control the analysis in Fluent. All the necessary items can be found in the solver under Run Calculation menu. This is where the coefficients can be modified on an ongoing basis so that our residual equations are at the required level.
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| Example of residual plot in Fluent |
An important step in modeling is to define the precision of calculations and the criterion of convergence.
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| How to define precision of solver in Fluent |
The figure above shows the definition of static analysis based on the Courant number
In many problems that we want to model, we can meet with the movement of one or more elements. This is one of the three methods available from Ansys Fluent. The others are MRF and SRF (multi refernece frame, single reference frame). Sliding mesh is a traffic definition method for transient analyzes. The other methods can be used both in static and transient. They will be described in more detail in the following entries. In this post we will try to show you how to use the sliding mesh method.
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| How to add motion on parts in Fluent |
In today's post, we will deal with another error that may occur during the analysis. The error that is described below concerns Fluent and the wrong definition of user monitors that are displayed during simulation. These can be monitors concerning the average velocity in the domain volume, the values of the maximum temperatures of the solid domains, the average values of the heat transfer coefficient from the defined planes of the model, etc. Generally speaking, today's entry is about how to correctly define monitors and how to transfer them between subsequent analyzes.
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| Example of "gui-domain-label" error in Fluent |
Meshing is one of the decisive steps in both CFD and FEA analysis. The correct execution of the mesh and optimization in terms of the number of finite elements makes the work of every Ansys user much easier.
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| Example of CFD mesh in Ansys Workbench |
We often spend a lot of time on complex models ( geometry ) to simplify or modify them. There are several ways to make your work easier on 3D modelling. In design modeler there is a function that can be described as multi extrude (add / slice material).
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| Many parts operations (extrude) in Ansys |
Breaking down the model into smaller pieces can also be useful for creating subdomains. They can be useful for modeling quasi fans or separating zones for measuring the values we are looking for. Separating zones in the model can also be used to simplify the model - getting rid of elements / volumes that are irrelevant to us in the simulation. Separation can also be used to redefine the association of certain regions in our model.
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| How to pick internal face in Design Modeler |
In the Design Modeler module, we can find many functions that are designed to manipulate our model. We can move it freely, scale its dimensions, apply Boolean operations, round and chamfer edges, etc. Everything to make our model simpler and thus have fewer finite elements, which will shorten the calculations. In the case of Structural Analysis, we will also reduce the risk of the so-called single-node distortions of the obtained values (unrealistic, non-physical values of e.g. stresses).
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| How to delete face in Design Modeler |
Often, when choosing turbulence models in Ansys CFX, we do not focus on additional functions that we can use for our problem. Proper definition of the turbulent model in the analysis can have a decisive impact on the gas flow in the domains and on the overall fluid mechanics.
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| Additional options of turbulence in Ansys CFX |
Usually we choose the standard SST turbulence model in Ansys CFX without knowing what is purpose of SST and other models that can be defined in Ansys CFX Workbench. In this post we will try to explain each of the turbulence models which U can pick in Ansys CFX.
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| Turbulence window in Ansys CFX |
Everyone sholud be aware which heat transfer model should to choose for his own case. You have to choice from three heat transfer models in Ansys CFX - thermal energy, total energy and isothermal. The simplest is isothermal which doesn't include heat transfer - therefore use it only for easy flows.
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| Types of heat transfer models |
