How to... fix "gui-domain-label: no domain selected" in Ansys Fluent and MEMERR in CFX

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.

Example of "gui-domain-label" error in Fluent 

How to... correctly mesh CFD model in Ansys CFX and 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. 

Example of CFD mesh in Ansys Workbench

How to... make multi extrude in Design Modeler 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). 

Many parts operations (extrude) in Ansys 

How to... slice geometry / model into smaller parts Ansys Workbench Design Modeler

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. 

How to pick internal face in Design Modeler

How to... delete face - simplification geometry Design Modeler / Ansys Workbench

 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).

How to delete face in Design Modeler

How to... choose additional options in turbulence models Ansys CFX

 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.

Additional options of turbulence in Ansys CFX

How to... pick turbulence model 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. 

Turbulence window in Ansys CFX

How to... choose correct heat transfer model 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. 

Types of heat transfer models

How to ... plot isosurfaces post processing Ansys CFX, Fluent

 Very interesting option in Ansys post processing is Isosurface plot. This option is very useful when analyzing complex models where regular CONTOUR does not work. In a selective way, we can display our interesting values using conditional volumes. ISOSURFACE in a nutshell is to display the volume of model for value less than or greater you assume. For example, if we want to display regions in the model where the speed is greater than 10 m/s, then the use of the ISOSURFACES function is recommended.

Example of isosurface plot in Ansys CFX results 

How to choose... model - pressure based or density based Ansys Fluent ?

 One of the first steps in the preprocessor in Ansys Fluent is selecting a fluid mechanics solver. This is the first decision block that will determine the direction in which we want to define our boundary and initial conditions, which strictly depends on our assumptions.

Pressure or Density based solver in Fluent 

How to... plot contours in Ansys CFX / Fluent postprocessing

 The key stage of postprocessing is the proper definition of plotting maps of temperature, velocity, pressure, etc.

Contours in Ansys CFX results 

How to... copy / duplicate simulation Ansys Workbench

 Complicated models or a large number of boundary conditions variants require us to perform many analyzes. For large models, performing multiple simulations may be due to calibration towards imbalances.

Block schema in Ansys Workbench

How to... change timestep in postprocessing Ansys CFX

 Data processing and analysis are an important element in postprocessing especially for transient analyzes. In CFX, from the RESULTS level, we can analyze velocity or temperature distributions for each defined and saved step. 

How to change time step in CFX

How to... export results from figures Ansys CFX

 After completing the calculations, an important step is to save the results of the defined monitors. Instead of generating additional postprocessing charts can be generated using monitors solver and after save to disk. This is often a much faster method than creating charts manually.

CFX Solver window