47 FREE ENGINEERING TOOLS + 5 CONNECTED WORKFLOWS
One engineering tool hub. From CFD setup to thermodynamics.
Search, calculate and cross-check the engineering quantities behind CFD, heat transfer, HVAC, refrigeration, phase equilibrium and validation—or use a connected workflow to propagate one set of assumptions through several calculations.
Start from the engineering problem, not from a software menu.
The hub is organized around physical questions engineers repeatedly need to answer: how fine should the mesh be, what turbulence quantities belong at an inlet, whether a surface will condense, whether a refrigeration state is plausible, or whether a CFD result is numerically credible.
Choose the engineering question you are trying to answer.
Use these paths when you know the problem but not yet which calculator you need.
How should I mesh it?
y+, prism layers, boundary layers, wall treatment, mesh QA and computational cost.
FLOW SYSTEMSWhy is my pressure loss wrong?
Mass flow, hydraulic diameter, friction factor, K factors, Darcy losses and porous media.
THERMALDoes the heat-transfer result make sense?
Convection, Nusselt correlations, natural convection and heat-exchanger balances.
HUMIDITY & PHASE CHANGEWill it condense or boil?
Psychrometrics, dew point, wet bulb, condensation, saturation and VLE bubble/dew temperatures.
HVAC & REFRIGERATIONIs the refrigeration cycle healthy?
Superheat, subcooling, compressor efficiency, COP, cycle balance, charge and cooling-coil performance.
VERIFICATIONCan I trust the CFD result?
GCI, mesh independence, validation error metrics, coefficients and troubleshooting.
Connect several tools into one engineering decision chain.
Enter shared assumptions once, propagate them through linked calculations, generate an engineering report and surface contradictions before they reach the simulation or system model.
CFD Setup
Reynolds → k/ε/ω → y+ → first-cell height → prism stack → timestep.
Open workflow →LIVE · WORKFLOW 002Internal Flow
Flow rate → hydraulic diameter → friction factor → losses → pressure and power.
Open workflow →LIVE · WORKFLOW 003Thermal / HVAC
Humid air → dew point → condensation → sensible/latent cooling → condensate.
Open workflow →LIVE · WORKFLOW 004Refrigeration
Superheat/subcooling → compressor efficiency → COP → cycle capacity and balance.
Open workflow →LIVE · WORKFLOW 005CFD Verification
GCI → conservation → timestep sensitivity → validation → evidence verdict.
Open workflow →WORKFLOW HUBAll Engineering Workflows
Compare all five connected workflows, detailed tool links, report/share behavior and engineering handoff.
Browse workflows →Six high-value checks across the hub.
Useful entry points when you want a fast physical or numerical sanity check.
y+ & First Cell Height
Translate a wall-treatment target into a near-wall mesh scale.
Open tool → CFD VERIFICATIONGrid Convergence Index
Quantify discretization behavior with a three-grid study.
Open tool → INTERNAL FLOWPressure Drop
Benchmark Darcy–Weisbach pressure loss before blaming the CFD model.
Open tool → HUMID AIRPsychrometric Calculator
Humidity ratio, dew point, enthalpy and moist-air density in one state check.
Open tool → THERMODYNAMICSBubble Point Temperature
Check ideal-mixture VLE at a specified pressure with visible Antoine data.
Open tool → REFRIGERATIONVapor-Compression Cycle
Balance the four principal refrigerant states from enthalpy data.
Open tool →Browse all engineering tools by discipline.
Use the search and filters above to narrow the catalog. Thermodynamics, humidity and refrigeration sections are part of the same hub and use the same analytics and QA system as the CFD tools.
Design the mesh around the physics.
Near-wall spacing, prism growth, boundary-layer scale, wall treatment and computational planning.
y+ & First Cell Height
Estimate first-cell distance from target y+, velocity and fluid properties.
Open tool → LIVEMESH / 004Prism Layer Calculator
Calculate first layer, final layer, total thickness and layer count with geometric growth.
Open tool → LIVEMESH / 010Boundary Layer Thickness
Estimate a smooth flat-plate boundary-layer scale for near-wall mesh planning.
Open tool → LIVEADVISOR / 011Wall Treatment & y+ Advisor
Choose a starting RANS wall-treatment and y+ strategy from modelling goals and mesh budget.
Open tool → LIVEADVISOR / 012CFD Mesh Advisor
Build a prioritized mesh checklist for walls, gaps, wakes, interfaces, VOF, CHT and motion.
Open tool → LIVEMESH / 033Mesh Cell Count, Memory & Cost
Estimate cells, prism contribution, RAM allowance and computational work before meshing.
Open tool →Turn inlet assumptions into explicit boundary values.
Reynolds regime, turbulence intensity, k, ε and ω.
Turbulence Inlet k, ε & ω
Calculate turbulence variables from mean velocity, intensity and length scale.
Open tool → LIVETURB / 017Turbulence Intensity Estimator
Estimate a starting inlet turbulence intensity from Reynolds number for developed internal flow.
Open tool → LIVEFLOW / 002Reynolds Number
Calculate Reynolds number and interpret flow-regime implications.
Open tool →Build a consistent bulk-flow and pressure-loss model.
Flow rate, hydraulic diameter, friction, local losses and porous resistance.
Pipe & Duct Flow
Convert between mass flow, volume flow and velocity with area, Dh, Re and dynamic pressure.
Open tool → LIVEFLOW / 006Hydraulic Diameter
Calculate Dh for circular, rectangular, annular and custom wetted sections.
Open tool → LIVEFLOW / 018Darcy Friction Factor & Moody
Compare Colebrook, Swamee–Jain and Haaland Darcy friction factors with roughness.
Open tool → LIVEFLOW / 007Pressure Drop
Darcy–Weisbach major/minor pressure loss with Reynolds-dependent friction.
Open tool → LIVEFLOW / 019Minor Loss & K-Factor
Convert fitting K values into pressure/head loss or infer K from a measured loss.
Open tool → LIVEPOROUS / 029Porous Media Darcy–Forchheimer
Separate viscous and inertial porous pressure-drop contributions.
Open tool →Challenge energy balances with independent thermal scales.
Convection, natural convection, Nusselt correlations, heat exchangers and unit consistency.
Heat Transfer Calculator
Calculate convection heat transfer, heat flux or sensible fluid heating.
Open tool → LIVETHERMAL / 020Natural Convection
Estimate Rayleigh, Prandtl, Nusselt number and natural-convection h.
Open tool → LIVETHERMAL / 021Nusselt & Heat-Transfer Coefficient
Estimate Nu and h for internal pipe/duct or external flat-plate flow.
Open tool → LIVETHERMAL / 022Heat Exchanger ε-NTU & LMTD
Calculate effectiveness, NTU, heat duty, outlet temperatures and LMTD.
Open tool → LIVEUTILITY / 009Engineering Unit Converter
Convert pressure, temperature, velocity, flow, viscosity, density and thermal units.
Open tool →Connect Mach number, choking and rotor time scales.
Nozzle relations, mass-flow limits, blade-passing frequency and sliding-mesh timestep.
Mach Number
Calculate Mach number, speed of sound or velocity and review compressibility implications.
Open tool → LIVECOMP / 023Compressible & Choked Flow
Check critical pressure ratio and estimate ideal-gas choked mass flow.
Open tool → LIVECOMP / 024Isentropic Nozzle & Area–Mach
Calculate area ratio, static/stagnation ratios, velocity and critical area from Mach.
Open tool → LIVEROT / 025Rotating Machinery Tip Speed & BPF
Calculate angular speed, tip speed, tip Mach, rotational period and blade-passing frequency.
Open tool → LIVEROT / 026Rotating Mesh Time Step
Resolve angular travel and blade-passing events for transient rotor–stator simulations.
Open tool →Compare inertia, surface tension, gravity and timestep constraints.
Dimensionless groups and transient resolution for free-surface and multiphase CFD.
Multiphase Dimensionless Numbers
Calculate Reynolds, Weber, Froude, Bond, Capillary and Ohnesorge numbers.
Open tool → LIVEMULTI / 028VOF & Free-Surface Time-Step Advisor
Compare convective, capillary and gravity-wave timestep scales.
Open tool → LIVENUM / 003Courant Number & Time Step
Calculate Courant number or timestep from velocity and local cell size.
Open tool →Test whether the numerical result deserves confidence.
Grid convergence, validation error metrics, force coefficients and structured troubleshooting.
Grid Convergence Index & Mesh Independence
Estimate observed order, Richardson extrapolation and GCI from a three-grid study.
Open tool → LIVEVERIFY / 032CFD Validation Error Metrics
Compare CFD and experimental data with RMSE, MAE, bias, MAPE and correlation.
Open tool → LIVEAERO / 030Aerodynamic Coefficients
Convert forces and moments to Cd, Cl and Cm—or recover dimensional loads.
Open tool → LIVEAERO / 031Pressure Coefficient Cp
Calculate Cp from static/reference pressure and dynamic pressure, or invert the relation.
Open tool → LIVEADVISOR / 013CFD Troubleshooter
Turn common CFD symptoms into a structured diagnostic sequence.
Open tool →From humid-air condensation to bubble and dew temperatures.
Psychrometric state calculations, HVAC moisture balances and transparent phase-equilibrium checks for thermal engineering and CFD.
Psychrometric & Humid Air Calculator
Humidity ratio, dew point, vapor pressure, moist-air enthalpy, specific volume and density.
Open tool →LIVETHERMO / 035Dew Point Calculator
Solve temperature, relative humidity or dew point from any two values, then check surface-condensation risk.
Open tool →LIVETHERMO / 036Wet-Bulb Temperature
Estimate thermodynamic wet-bulb temperature from dry-bulb, RH and pressure.
Open tool →LIVEHVAC / 037Humid Air Mixing
Mix two moist-air streams using dry-air mass, humidity-ratio and enthalpy balances.
Open tool →LIVEHVAC / 038Dehumidification, Condensate & Cooling Load
Calculate water removal and air-side enthalpy load between inlet and outlet states.
Open tool →LIVETHERMO / 039Saturation Pressure & Boiling Temperature
Move between saturation pressure and temperature with visible Antoine coefficients and range limits.
Open tool →LIVEVLE / 040Bubble Point Temperature — Ideal Mixtures
Solve ideal-mixture bubble temperature from liquid composition, pressure and Antoine coefficients.
Open tool →LIVEVLE / 041Dew Point Temperature — Ideal Mixtures
Solve ideal-mixture dew temperature from vapor composition, pressure and Antoine coefficients.
Open tool →Connect refrigerant states to cycle and air-side performance.
Superheat, subcooling, compressor efficiency, COP, four-state cycle balances, refrigerant inventory and cooling-coil psychrometrics.
Superheat & Subcooling
Check compressor-inlet superheat and liquid-line subcooling from measured and saturation temperatures.
Open tool →LIVEREFRIG / 043Compressor Isentropic Efficiency & Power
Calculate ηis, specific work and refrigerant-side compressor power from enthalpy states.
Open tool →LIVEREFRIG / 044Refrigeration COP, EER & Capacity
Convert cooling capacity and compressor power into COP, EER, heat rejection, tons and kW/ton.
Open tool →LIVEREFRIG / 045Vapor-Compression Cycle Balance
Balance a four-state refrigeration cycle using enthalpy, mass flow and first-law consistency.
Open tool →LIVEREFRIG / 046Refrigerant Charge, Quality & Void Fraction
Estimate two-phase inventory and convert homogeneous void fraction to mass quality or vice versa.
Open tool →LIVEHVAC / 047Cooling Coil SHR, ADP & Bypass Factor
Calculate sensible heat ratio, coil apparatus dew point, bypass factor and air-side cooling loads.
Open tool →Use the calculator first. Use the Technical Case when the CFD still disagrees.
The tools provide transparent baselines and planning checks. Technical Cases explain what to diagnose when the solved model behaves differently, and consulting is available when the answer depends on the actual case.