Simulation 2-blade Stirrer with Baffle

Figure 1: CAD model created in NOGRID's COMPASS

Figure 2: Setup the mixing case within the GUI

Figure 3: Results of the mixing process shown within NOGRID points' GUI

Figure 4: Mixing simulation: velocity field and free surface for 2-blade stirrer with baffle

If you want to simulate the mixing process in a 2-blade stirrer with baffle, NOGRID software is a great choice. The 2-blade stirrer in this case study is a tangential impeller type and is mostly used for medium-viscosity media. The container shapes often have different degrees of slenderness and bottom shapes. This 2-blade stirrer has a conical bottom and is therefore suitable for pressure-resistant stirring processes. In addition, the conical design of the bottom allows quick emptying. Containers with high aspect ratios, such as in this case study, are more likely to be manufactured for large volumes. The 2-blade stirrer has no pronounced conveying effect as the container is only moved tangentially. Furthermore, baffles are used here. The baffle prevents the tangential rotation of the liquid and thus the formation of a tromb.

Mixing is an important part in chemical industry and appears in processes such as dispersion of two or more liquid, powdery or gaseous ingredients, deagglomeration to avoid lumps and homogenization of mixtures.

Improve product performance and reduce costs

Mixing simulation can help to understand the flow in an agitator, to quickly suggest improvements to construction and operation parameters and to reduce production and maintenance expenses.

Compute any conceivable agitator geometry with mixing simulation

NOGRID offers a wide range of rheology models including those found in chemical industry. NOGRID's unique abilities to handle moving parts in the fluid domain allow the simulation of any conceivable agitator geometries and operation modes such as

  • rotating and counterwise rotating agitator blades, possibly moving up and down periodically at the same time
  • overlapping operation ranges of moving parts as found in twin-screw agitators
  • free surfaces at inlets or for different fluid levels or for fast rotating agitators with high centrifugal forces

Benefit of very short computation time

The particular strengths of NOGRID's meshless CFD software are the rapid preprocessing (no grids need to be generated) and the outstanding short computation time even for complicated moving parts commonly found in agitators.

NOGRID unites abilities to handle free surface flow and moving parts in the domain. This leads to the following advantages:

  • computation is in full 3D solving complete Navier-Stokes-Equations
  • easy and intuitive setup  for mixing cases
  • free definable material properties by equations or curves
  • evaluation of the mixing quality
  • open or closed domains including inflow and outflow areas (non-batch mode)
  • moving of the mixers in any direction

Nogrid's strengths

Particular strengths of NOGRID's fluid flow CFD software are the rapid preprocessing (no fluid grid needs to be generated, only the boundary mesh, inner finite points are generated automatically depending on User setting initially and during computation), and the outstandingly short computation time even for complicated cavities.
As you can see in the image below, the boundary of the geometry still requires a mesh to allow the interior finite points to detect the boundary. The boundary must therefore be meshed and the finite points inside are automatically generated during the simulation controlled by User specifications.
Easy Modelling

Easy and fast modelling: Build geometry, mesh boundary, setup the case and start computation

What is CFD from NOGRID?


CFD solves the fundamental equations that define the fluid flow process. With CFD software from NOGRID every engineer makes better decisions by predicting, analyzing and controlling fluid flow, heat and mass transfer or chemical reaction. By using NOGRID software for flow modeling you receive information on essential flow characteristics as for example flow distribution. Using it additional to testing and experimentation NOGRID software helps to improve the evaluation of your design – resulting in better construction and operation parameters, increasing planning security and money savings due to faster time to the marketplace for your product or process.




With NOGRID, you choose professional CFD software and services – our aim is helping you to be successful. When you decide to work with NOGRID you choose close cooperation with a dynamic, flat hierarchies-organization. Short information channels result in quick and accurate professional support and service. Our team consists of highly qualified employees, who are experts in fields such as numerical simulation or computational fluid dynamics. Based on our know-how, we are pleased to offer the following services, responding to your individual requirements:




In our two-days training courses you will learn, how to use NOGRID CFD software efficiently. Our technical support team will teach you how to handle and solve different cases.

For more details please refer to Training Courses →


Technical Support


We offer full professional support from the minute you start using our software, by telephone or by email. Contact us, when ever needed.

For more details please refer to Software Support




Lack of time or resources and other constraints often make outsourcing an attractive solution. We help you with your flow modeling needs. Based on our engineering expertise in this field we offer individual numerical simulation services matching the unique needs of your organization.

For more details please refer to Simulation Services →


Göttelmannstr. 13B
55130 Mainz, Germany

Simulation Software from Nogrid

Follow Us: