Learning Forum

[gl6fp]

I am trying to make a simulation where I only need a fine region near the center, and no fine region anywhere else. But the workbench LS DYNA just divides it into equal cubes. Is there a way to tweak that or will i have to use LS prepost? 

[Nanda]

Hello user,

I’m not sure, but maybe sub-modelling can help here. 

Submodeling is a powerful technique used to enhance mesh resolution and solution accuracy in a specific region of interest, without the need to refine the entire model. This approach significantly reduces computational cost while maintaining precision where it matters most.

Step 1: Build and Solve the Global Model

1. Create the Global Model
   Begin by setting up your coarse mesh model in ANSYS Workbench LS-DYNA.

2. Apply Loads and Boundary Conditions
   Define all necessary loads and constraints for the simulation.

3. • *INTERFACE_COMPONENT_FILE

     Export Cut Boundary Data
     Use LS-DYNA command objects to include the following keywords:

   • *INTERFACE_COMPONENT_NODE_ID
     These commands will generate a file containing the cut boundary data.

4. Run the Simulation
   Solve the global model and retrieve the cut boundary file for use in the submodel.

Step 2: Create and Solve the Submodel

1. Set Up the Submodel
   Create a new model in Workbench focused on the region of interest. Use a finer mesh to improve accuracy in this area.

2. Align with the Global Model
   Ensure the submodel is correctly positioned relative to the global model geometry.

3. • *INTERFACE_LINKING_FILE

     Map Cut Boundary Data
     Use command objects to include:

   • *INTERFACE_LINKING_NODE_SET
     These keywords will map the cut boundary data from the global model to the submodel.

4. Solve the Submodel
   Run the simulation using LS-DYNA, now with the mapped boundary conditions applied.

Let us know how this goes.

Regards,

Nanda.

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