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Featured Simulations
Corrosion Under Insulation (CUI) Risk Assessment Tool (API 581 / NACE SP0198)
Free advanced-engineering-tool CUI risk assessment calculator per API 581 and NACE SP0198. Evaluates operating temperature, insulation type, coating condition, pipe material, location factors, and climate zone to produce risk scores, estimated corrosion rates, remaining wall life, and inspection priority. Animated pipe cross-section, temperature gradient heatmap, corrosion progression, and risk matrix visualizations. No free tool like this exists online.
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Heat Pump Water Heater Sizing & Savings Calculator
Free heat pump water heater (HPWH) sizing calculator with savings comparison vs standard electric and gas water heaters. Calculate annual energy cost, payback period, utility rebate eligibility, and installation space requirements. Includes animated heat pump cycle, temperature gradient visualization, and optimal tank size recommendation per DOE and ENERGY STAR guidelines.
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Induction vs Gas Cooking Cost & IAQ Tool
Free induction vs gas stove cost and indoor air quality calculator. Compare energy cost, cooking speed, NO2/PM2.5/CO emissions from gas burners. Model ventilation requirements to maintain safe IAQ. Calculate annual cost difference with local electricity and gas rates. Find break-even electricity price where induction beats gas.
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Small Server Room Ventilation vs AC Comparator
Free server room cooling calculator comparing ventilation-only, portable AC, split system, and in-row cooling for 1-10 rack rooms. Calculate BTU requirements, energy costs, PUE, reliability scores, and total cost of ownership using ASHRAE TC 9.9 guidelines. Includes animated heat flow visualization and auto-optimizer.
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Optimum Autofrettage Pressure Solver: Quartic Fits, Flat Optima and Sobol Uncertainty
Free optimum autofrettage pressure calculator. Differentiate FE-fitted quartics of bore hoop stress for a 15-5PH thick cylinder, find the 960 / 937 / 882 MPa optima, compare an assumed 0.4 overstrain threshold under von Mises and Tresca, and attach uncertainty to every input with live Sobol indices.
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Shakedown Boundary Calculator: Autofrettaged Cylinder Bree Map with Ratcheting Limits
Free shakedown and ratcheting calculator for thick-walled autofrettaged cylinders. Drag the operating point on a live Bree-style map of pulsating pressure against through-wall temperature range, see which limit it breaks first, and get the minimal pressure or temperature cut back to shakedown.
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Cracked Cylinder Prototype Similarity Checker: Fracture Test Scaling and Size Effect
Free fracture-similitude tool for down-scaled cracked cylinders. Set a/W, r_i/r_o, (p_i - p_o)/sigma_y and r_p/W, pick a scale factor, and the tool builds the original and prototype, audits J scaling, plastic-zone size ratio, crack-tip offset and the ASTM E399 size rule, then finds by bisection the largest scale-down you can trust.
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Nuclear RPV Loss-of-Heat-Sink Transient: Steel and Coolant Co-Simulated
Free reactor pressure vessel heat-up calculator. When 1200 MW of core power loses 10 % of its heat sink, how fast does the vessel heat? Rebuild the lumped-capacitance NRPV.m model (842.66 s), then co-simulate steel and coolant with a coupling-strength slider, switch on radiation, fix the spherical-head sign and see which correction actually moves the answer.
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Condenser Vacuum & Turbine Efficiency Sensitivity: Sobol Uncertainty Analysis on a Steam Cycle
Free condenser vacuum and turbine efficiency calculator on IAPWS-IF97 steam tables. Sweep condenser pressure from 0.02 to 10 bar, link it to cooling-water temperature and flow, and run a Web Worker uncertainty analysis with 1,024 Sobol samples, P5/P50/P95 fans and first-order Sobol indices for cycle efficiency and exhaust quality.
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Thick-Cylinder Thermal Shock Stress Calculator: Transient Hoop Stress with Biot Coupling
Free thermal shock stress calculator for thick-walled cylinders. Solve transient radial conduction with a Biot-number coupling slider, watch the Timoshenko hoop stress profile evolve, compare it with an equivalent external pressure, and stack autofrettage residual, thermal shock and working pressure.
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Vessel Skirt Hot Box Thermal Simulator: Junction Temperature, Thermal Stress and P+Q Check
Free skirt hot-box simulator for hot towers. Replays a illustrative transcribed FEA report through a thermal resistance network, a conducting skirt fin and shell discontinuity stresses, with a residual bar for every illustrative transcribed value. Change the air-gap physics, steel conductivity or insulation health and see the illustrative P+Q range gate, K_e and fatigue-life comparison respond (ASME clauses and report evidence unverified).
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Orbital Force Balance: Gravity vs Centripetal Force, and Which Mass Actually Matters
Does the Earth's mass affect its orbit? Balance gravity against centripetal force and watch the planet mass cancel, then measure it: a dual-number (forward-mode automatic differentiation) orbit integrator reports exact derivatives of the period and orbit size with respect to both masses, paints a sensitivity map over five decades of planet mass, and computes the barycentre and the orbital drift from solar mass loss.
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Photosynthesis Lab Simulator
Free photosynthesis rate simulator. Adjust light intensity, CO2 concentration, and temperature to measure oxygen production rate. Identify limiting factors and optimal growing conditions. Perfect for biology and botany students. Try it free!
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Seasons Simulator - Earth Axial Tilt & Day Length
Free seasons simulator showing how Earth's 23.5° axial tilt creates seasons. Visualize solstices, equinoxes, day length changes, and sunlight angles throughout the year.
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PID Controller Tuning Simulator
Free PID controller tuning simulator. Adjust proportional, integral, and derivative gains to optimize step response. Visualize overshoot, settling time, and steady-state error in real-time. Perfect for control engineering students. Try it free!
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Wood Beam Span Calculator — Lumber Sizing per NDS & IRC
NDS 2024-compliant wood beam span calculator with species/grade selection, bending/shear/deflection checks, adjustment factors, and animated beam visualization. Supports lumber, glulam, and LVL members.
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PLC Ladder Logic Simulator: Free Interactive Ladder Diagram Builder
Build and simulate PLC ladder logic diagrams with animated power flow, timers, counters, and I/O visualization. Free online tool for learning industrial automation programming.
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Nuclear Reactor Power Plant Simulator
Interactive nuclear reactor power plant simulator covering 8 reactor types: PWR, BWR, CANDU, SMR, micro reactors, thorium MSR, sodium-cooled fast breeders, and Gen IV HTGR. An advanced-engineering-tool for nuclear power analysis with real-time neutronics, thermal-hydraulics, decay heat modeling, LCOE economics, and animated reactor schematics.
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Cell Division Mitosis Simulation - Interphase vs Prophase Comparison
Explore cell division with our free interactive mitosis simulation. Step through each phase and visualize chromosome separation. Perfect for biology students. Try it now!
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Sorting Algorithm Visualizer
Free sorting algorithm visualizer. Compare bubble sort, merge sort, quick sort, and heap sort step-by-step. Track comparisons, swaps, and time complexity O(n log n) vs O(n²).
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Bridge Stress Simulator
Explore bridge stress with our free interactive truss simulator. Adjust loads and bridge types to visualize tension and compression. Perfect for engineering students. Try it now!
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Fluid Pressure and Flow Simulator
Free fluid pressure and flow simulator. Adjust pipe velocity, cross-section area, and elevation to see Bernoulli's principle in action. Calculate pressure changes and flow continuity. Perfect for physics and engineering students. Try it free!
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Sound Wave Simulator with Real Audio - Hear & See Waves
Explore sound waves with our free audio simulator. Adjust frequency, amplitude, and waveform to hear and see waves in real-time. Perfect for physics students. Try it now!
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Mendelian Genetics Breeding Simulator
Explore Mendelian genetics with our free interactive breeding simulation. Adjust traits and generations to visualize inheritance patterns. Perfect for biology students. Try it now!
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