Simulation spiral or screw stirrer

Spiral or screw stirrer CAD building groups in NOGRID's COMPASS

Figure 1: CAD model created in NOGRID's COMPASS

Mixing with spiral or screw stirrer GUI setup and initial conditions

Figure 2: Setup the mixing case within NOGRID points' GUI

Mixing with spiral screw stirrer - simulation results in NOGRID points' GUI

Figure 3: Results of mixing with spiral screw stirrer displayed in NOGRID points' GUI

Animation mixing with spiral screw stirrer in NOGRID points CFD software

Figure 4: Mixing simulation in NOGRID points software: velocity field and free surface for spiral screw stirrer

The simulation of mixing in a spiral or screw stirrer can be easily performed using NOGRID points CFD software.

In this case study, the spiral or screw stirrer is an axially conveying type, typically used for highly viscous media. The containers used with such agitators often vary in slenderness and bottom geometry. The paddle stirrer in this example features a flat-bottomed vessel and is therefore suitable only for non-pressurized mixing processes. Slim, tall containers - such as the one in this study - are usually designed for handling large volumes. The spiral or screw stirrer generates a strong conveying effect in the axial direction.

Mixing plays a key role in the food and chemical industries and is involved in processes such as the dispersion of two or more liquid, powdery or gaseous components, deagglomeration to prevent lump formation, and the homogenization of mixtures.

Improve product performance and reduce costs

Mixing simulation help you better understand flow behavior inside an agitator, quickly identify potential improvements in design and operating parameters, and reduce both production and maintenance costs.

Compute any conceivable agitator geometry with mixing simulation

NOGRID offers a wide range of rheology models, including those commonly used in the chemical industry. Its unique capabilities for handling moving parts within the fluid domain make it possible to simulate virtually any agitator geometry and operating mode, 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 from very short computation times

One of the key strengths of NOGRID's meshless CFD software is its rapid preprocessing - no mesh generation is required - and its exceptionally short computation times, even for complex moving parts commonly found in agitators.

Capabilities of NOGRID points CFD software

NOGRID combines capabilities 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 also for FSI (Fluid-Structure-Interaction) 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

Whitepaper Mixing Technology

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 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.

Choose NOGRID

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:

TRAINING

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 →

Service

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 →