<p style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">Dear CP2K Developers,</p><p style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">I am currently running the string method in CP2K using three collective variables (CVs). However, during the simulation, I have observed that the CVs remain fixed, which makes the simulation behave more like a constrained molecular dynamics (MD) rather than a true string method optimization.</p><p style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">From my understanding, the string method should allow the system to evolve naturally along the reaction path while refining the string configuration. However, in my case, the constraints on the CVs seem to be preventing this, and I would like to understand if this is expected behavior or if I may be missing something in my input setup.</p><p style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">I do have a constraint section as follows:</p><p style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"> <span style="white-space: pre;"> </span>&CONSTRAINT<br /> <span style="white-space: pre;"> </span>&COLLECTIVE<br /> <span style="white-space: pre;"> </span>COLVAR 1<br /> <span style="white-space: pre;"> </span>INTERMOLECULAR<br /> <span style="white-space: pre;"> </span>&END COLLECTIVE<br /> <span style="white-space: pre;"> </span>&COLLECTIVE<br /> <span style="white-space: pre;"> </span>COLVAR 2<br /> <span style="white-space: pre;"> </span>INTERMOLECULAR<br /> <span style="white-space: pre;"> </span>&END COLLECTIVE<br /> <span style="white-space: pre;"> </span>&COLLECTIVE<br /> <span style="white-space: pre;"> </span>COLVAR 3<br /> <span style="white-space: pre;"> </span>INTERMOLECULAR<br /> <span style="white-space: pre;"> </span>&END COLLECTIVE<br /> <span style="white-space: pre;"> </span>&END CONSTRAINT<br /></p><p style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">Without it the simulation does not run.I would appreciate any insights on whether there are specific parameters or settings that need adjustment to ensure the correct implementation of the string method with multiple CVs. Please let me know if you need any additional details or input files to diagnose the issue.</p><p style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">Thank you for your time and support.</p>
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