About Mainspring
Mainspring Energy manufactures and delivers fuel-flexible, low-emissions local power solutions that rapidly add new capacity and deliver reliable, affordable, and sustainable electric power. The company began commercial shipments of its Mainspring Linear Generators in 2020 and today has hundreds of megawatts in advanced development and field operations for leading Fortune 500 companies, data centers, and utilities. Mainspring also partners with global energy leaders including AEP, NextEra Energy Resources, Schneider Electric, and more.
The core values that ground our work, guide our decisions, and connect us together:
- Pragmatic Optimism
- Excellence without Ego
- Proactive Collaboration
Job Overview
Mainspring is seeking a Senior Simulation Engineer to own the structural and thermal simulation work that drives design decisions on our Linear Generator platform. In this role, you will embed with Mechanical project teams, build and calibrate Ansys Workbench models, and run closed loop, simulation driven design iterations that make hardware more reliable and cost effective while meeting all requirements.
This role is intended for engineers who have spent most of their career doing hands on FEA in Ansys Workbench, want to keep deepening that expertise, and have repeatedly turned simulation results into design changes that held up in test. A strong candidate treats every model as unproven until it matches hand calculations and test data, states clearly how much confidence a result deserves, and works closely with design owners, test, and manufacturing to close the loop.
Responsibilities
Own the simulation workstream within significant mechanical projects, from defining the analysis questions, load cases, and acceptance criteria through results, recommendations, and design sign-off
Build, run, and maintain static structural, thermal, modal, and buckling models in Ansys Workbench, from single parts to large assemblies with bolted joints and contact interfaces, and assess fatigue, joint slip and separation, and bolt integrity
Drive closed loop, simulation driven design iterations with design owners, using parametric studies, sensitivity analysis, and optimization to reach designs that are more reliable and cost effective while meeting all requirements
Benchmark and calibrate models against analytical calculations and unit or component test data, sanity check results with deformed shapes and reaction load balance, and document assumptions, boundary conditions, mesh convergence, and the confidence limits of each result
Partner with test engineers to define instrumentation and test plans that produce the data needed to validate models, and feed test, production, and field results back into model fidelity
Communicate results, risks, and recommendations clearly in design reviews and risk reviews, including what drives each result (load case, mean vs. alternating stress, contact pressure vs. shear), so designers know what to change
Qualifications
BS or MS in Mechanical Engineering or a similar engineering field, with most of your career spent doing hands on FEA in Ansys Workbench on real hardware programs, and a clear interest in continuing to grow as a simulation specialist
Fluency in Ansys Mechanical or equivalent for static structural, steady state thermal, thermal structural, modal, and buckling analysis, including element selection (tet vs. hex, element order, hells, beams), bonded and frictional contact, remote points and MPC/RBE connections, bolt pretension, submodeling, and inertia relief. This includes large assembly models that take hours to solve and debugging solver errors and under constrained bodies; experience limited to CAD embedded simulation tools is not sufficient
Strong fundamentals in solid mechanics, heat transfer, fatigue (including Goodman or Gerber mean-stress correction), and failure theory, with a habit of checking simulation results against hand calculations and first principles estimates
Hands-on experience matching and calibrating models to unit or component test data, and quantifying how well a model predicts reality before using it to make design decisions
Proven track record of simulation driven insights that made designs more reliable, cost effective, or both, with results confirmed in validation testing, production, or the field
Strong collaboration and communication skills, including the ability to embed in a project team, challenge weak assumptions, and present results with clear recommendations to technical and non-technical stakeholders
Preferred Qualifications
MS or PhD with a focus in computational mechanics, fatigue and fracture, or thermal-structural analysis
Experience with durability methods for welded and high temperature components, such as structural hot spot or effective notch stress, strain life, thermo-mechanical fatigue, creep, or fatigue post processing tools like nCode DesignLife or the Ansys Fatigue Tool
Experience automating and scaling analysis with Workbench parameters, DesignXplorer or optiSLang, APDL command objects, or Python scripting, and running large jobs on remote or cloud solve resources such as Ansys RSM
Experience with harmonic and dynamic response, transient structural or thermal analysis, explicit dynamics, acoustics, or mapping CFD thermal results (Fluent or CFX) into structural models
Experience analyzing hardware for energy systems, engines, generators, compressors, pumps, exhaust systems, thermal systems, high-cycle fatigue environments, or industrial equipment
Experience coaching design engineers to run their own analyses and building simulation skills across a team, or creating simulation best practices, model review checklists, or validation standards that help the team move faster
