How to model a glass fiber roving with FiberGeo and predict permeability with FlowDict

The tutorial “How to model a glass fiber roving with FiberGeo and predict permeability with FlowDict” demonstrates how to model a digital glass-fiber roving using FiberGeo and subsequently predict its permeability with FlowDict. First, a fiber structure is generated by defining parameters such as fiber diameter, solid volume fraction, fiber orientation, and the distance between fibers. In this example, infinite glass fibers are oriented in the X-direction and generated with a solid volume fraction of 50%. The resulting structure is then inspected and visualized in both 2D and 3D.

Next, a flow simulation is performed with FlowDict using the LIR solver to calculate the permeability tensor of the roving. The results include permeability, flow velocity, flow rate, and pressure distribution in all three spatial directions. In the Result Viewer, the simulation results can also be visualized as 3D volume fields as well as streamlines and animated streamlets. The tutorial is aimed at GeoDict users who want to model fiber structures and analyze their flow and permeability properties.

• Create the glass-fiber roving: Learn how to generate a unidirectional fiber structure in FiberGeo with defined fiber diameter, volume fraction, orientation, and spacing.
• Set the fiber parameters: Use infinite circular glass fibers with a diameter of 10 µm and a solid volume fraction of 50%. 
• Define fiber orientation: Align the fibers in the X-direction and apply an isolation distance between neighboring fibers. 
• Generate and inspect the structure: Create the roving and check volume fraction, overlap, and orientation in the Result Viewer. 
• Set up the flow simulation: Use FlowDict with the LIR solver and the Stokes equation. 
• Define boundary conditions: Simulate all three spatial directions with symmetric boundary conditions and a pressure drop of 0.02 Pa. 
• Calculate permeability: Run the simulation and evaluate the permeability tensor, velocity, flow rate, and pressure distribution. 
• Visualize the results: Display the flow as 3D volume fields, streamlines, and animated streamlets. 
• Practical application: Build a complete workflow from fiber structure generation to permeability prediction and flow visualization in GeoDict.