Making Molecular Simulations Truly Interactive in SAMSON

Molecular modelers often face challenges when trying to interact with their molecular systems while simulations are running. Adjusting atomic positions in real time, observing changes, and having simulations respond dynamically can significantly enhance understanding and streamline workflows. SAMSON, the integrative molecular design platform, offers a robust solution to this pain point: interactive simulations.

The Power of Interactive Simulations: What to Expect

Unlike traditional tools, SAMSON lets you interact directly with atoms and molecules during simulations. This unique feature allows you to exert control over the system dynamically and observe how the system’s geometry evolves with your input.

At the heart of this process are “simulators” within SAMSON. These simulators integrate three essential components:

  • Dynamical models: These describe the degrees of freedom of the molecular system.
  • Interaction models: These compute energies and forces, often corresponding to force fields.
  • State updaters: These update the system’s state during the simulation. For instance, integrators function as state updaters.

This means you can tweak molecules or entire systems during the simulation process, making results more intuitive and adaptable.

Step-by-Step: Launching an Interactive Simulation

Here’s how you can set up your own interactive molecular simulation in SAMSON:

  1. Start by adding a molecule to your workspace. You can achieve this by:
    • Adding any molecule from the Asset Browser.
    • Switching to the Add editor on the left-side menu and clicking anywhere in the viewport to place an atom.
  2. Add a simulator via Edit > Add simulator or the shortcut (Ctrl + Shift + M for Windows/Linux or Cmd + Shift + M for macOS).
  3. Choose an interaction model (e.g., Universal Force Field) and a state updater (e.g., Interactive modeling).
  4. Provide a name for your simulator (optional) and click OK.
  5. Launch the simulation by selecting Edit > Start simulation or simply pressing X.

Once the simulation is running, you can select individual atoms, drag them, and observe how the molecule responds interactively while still adhering to the physical rules defined by the selected models and force fields.

Interactive simulation with UFF and interactive modeling state updater

Enhanced Control: Adjusting Simulation Parameters

SAMSON lets you fine-tune simulation dynamics to suit your system’s requirements. For instance, with the Interactive modeling state updater, you can adjust:

  • Step size: Determines how far the simulation advances per step.
  • Number of steps: Increasing this value can enhance system stiffness.

Experimenting with these parameters lets you find the perfect balance between precision and performance for your project.

Explore Interactive Simulation Further

The combination of immediate feedback, real-time interaction, and streamlined adjustments makes SAMSON a unique platform for molecular modelers. Try it out for building and testing molecular systems, tweaking geometries, and learning how molecular forces render complex dynamics across time scales.

Visit the full interactive simulations page on the official documentation here to explore additional features and tips.

SAMSON and all SAMSON Extensions are free for non-commercial use. Download SAMSON today at https://www.samson-connect.net.

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