i am trying to simulate a tunnel under blast loading in abaqus , i am using coupled eulerian lagrangian, I find some difficulties,Any help (tutorial ,steps) would be highly appreciated.
Engr. Tufail
Rida Bensailaa From this tutorial you can get idea; https://www.youtube.com/watch?app=desktop&v=vAwVTbWydAk&ab_channel=ABAQUSPOWER
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Abhinab Rath
Geometry and Meshing:-Create the geometry of the tunnel and the surrounding soil or rock. Mesh the tunnel and the surrounding soil/rock separately. Ensure that the mesh is refined enough to capture the important details of the simulation. Material Properties: Define material properties for the tunnel structure and the surrounding soil/rock. These properties should include density, elastic properties, and strength properties if applicable. Boundary Conditions: Apply appropriate boundary conditions to the tunnel and soil/rock domains. For example, fix the tunnel entrance or apply symmetry conditions if applicable. Blast Loading: Define the blast loading. You can use a pressure-time history curve or other blast models available in Abaqus. Apply the blast load to the exterior of the tunnel entrance or the location where the explosion occurs. Coupled Eulerian-Lagrangian (CEL) Setup: Create a CEL model to couple the tunnel and soil/rock domains. This involves defining the Eulerian region (soil/rock) and the Lagrangian region (tunnel). Set up the coupling parameters, such as friction, contact, and tie constraints between the Eulerian and Lagrangian regions. These parameters control how the two regions interact. Analysis Settings: Define the analysis type (e.g., explicit dynamic analysis). Specify the time step size and other numerical parameters. Set up any additional features like output requests for monitoring specific results. Run the Simulation:Submit the simulation for analysis. Abaqus will perform the calculations to simulate the tunnel's response to the blast loading over time. Post-Processing: After the simulation is complete, analyze the results to study the tunnel's behavior, including deformation, stress, and damage. Visualize and interpret the results to draw conclusions about the tunnel's performance under blast loading. Iterate and Validate: Depending on the results, you may need to iterate on the model, adjust parameters, or refine the mesh to obtain more accurate and meaningful results. Simulating a tunnel under blast loading in Abaqus using the coupled Eulerian-Lagrangian (CEL) method can be a complex task, but I have given the basic steps needed. All the best.
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