Thermal & Fluid Engineering
Thermodynamics Cycles • Heat Transfer • Heat Exchangers • Fluid Flow • Bernoulli • Pascal • Wind Tunnel • Refrigeration
21 toolsThermal and fluid engineering is where most students hit their first real engineering decisions. Up to this point you have been calculating numbers that mostly come out the same way every time. From here on, you are sizing pumps that have to push a real flow against a real head, picking refrigerants whose performance the regulator has already constrained, and choosing between counter-flow and parallel-flow heat exchangers based on the temperature differences you actually have.
The twenty-one simulators in this category split into three working areas that overlap in messy and interesting ways at the edges.
Thermodynamics — the science of energy conversion — lives in the cycles simulator (Carnot, Otto, Diesel, Brayton), the ideal gas law playground, and the gas law cousins (Boyle, Charles). The refrigeration cycle and four-stroke engine simulators apply the same first and second law machinery to real machines with real working fluids.
Heat transfer answers a different question: not “how much energy is there” but “how fast does it move”. The three modes simulator covers conduction (Fourier’s law), convection (Newton’s law of cooling), and radiation (Stefan-Boltzmann) side by side — the same three rates that dominate everything from a CPU heat sink to a pizza oven. The heat exchanger tool ties them together for industrial sizing problems with the LMTD and NTU methods.
Fluid mechanics — how liquids and gases move — gets the largest cluster. The Bernoulli simulator is the entry point: it covers about 70 % of the situations students meet in coursework. From there you move into pipe flow (Reynolds, friction factor, Darcy-Weisbach), Reynolds number on its own, and Pascal’s law for hydraulics. The wind tunnel sits at the boundary between fluid mechanics and external aerodynamics.
A practical observation: the hardest part of this material is not the equations but the unit conversions and sign conventions. Heat transferred to the system is positive in most thermodynamics conventions but negative in some heat-transfer ones. Pressures appear in Pa, kPa, bar, psi, and torr depending on which industry wrote the textbook. Every simulator here uses SI internally and exposes an Imperial toggle in the readouts. Practising with the toggle on, you build an instinct for converting in your head — which is the actual skill that distinguishes engineers who get on with the problem from engineers who spend an hour looking up factors.
Thermal & Fluid Engineering — Interactive Simulators for Engineering Education
Thermal and fluid engineering form the backbone of countless real-world systems, from power plants and HVAC systems to hydraulic presses and jet engines. These disciplines study how energy transfers as heat, how fluids behave under different conditions, and how thermodynamic cycles convert thermal energy into useful work. Our collection of 8 interactive simulators brings these abstract concepts to life, enabling engineering education and engineering students to experiment with parameters and observe results in real time.
Thermodynamics & Power Cycles
The study of thermodynamics revolves around energy conversion. Our Thermodynamics Cycles simulator lets you explore the four fundamental power cycles: the ideal Carnot cycle, the Otto cycle used in petrol engines, the Diesel cycle used in compression-ignition engines, and the Brayton cycle powering gas turbines. Each cycle is displayed on an interactive PV diagram with animated piston motion, allowing you to adjust compression ratio and heat input to see how efficiency changes. Understanding these cycles is essential for anyone working with engines, turbines, or power generation systems.
Heat Transfer: Conduction, Convection & Radiation
Heat always flows from hot to cold, but the mechanism varies. Our Heat Transfer simulator demonstrates all three modes with animated visualisations. Conduction transfers heat through direct molecular contact (Fourier’s law: q = −kA·dT/dx), convection involves bulk fluid motion (Newton’s law of cooling: q = hAΔT), and radiation transmits energy via electromagnetic waves (Stefan-Boltzmann law: q = εσAT&sup4;). Adjusting material properties and temperatures reveals how insulation, fin design, and surface emissivity affect heat flow rates.
Fluid Mechanics & Flow Analysis
Understanding fluid behaviour is critical in piping systems, aerodynamics, and hydraulic machinery. Our Fluid Flow simulator visualises laminar and turbulent flow with animated particles, calculating the Reynolds number that determines the flow regime. The Bernoulli’s Principle simulator demonstrates how velocity and pressure relate in moving fluids — the foundation of Venturi meters, carburettors, and aircraft lift. The Wind Tunnel simulator lets you test 6 different shapes in a virtual wind tunnel, observing streamlines, pressure distributions, and drag/lift coefficients.
Heat Exchangers
Heat exchangers are vital components in power plants, chemical processing, HVAC systems, and automotive cooling. Our Heat Exchanger simulator models a shell-and-tube heat exchanger using both the LMTD (Log Mean Temperature Difference) and NTU-effectiveness methods. You can switch between parallel-flow and counter-flow configurations, adjust inlet temperatures and flow rates, and observe how the temperature profiles and overall effectiveness change. Understanding heat exchanger design is essential for any thermal systems engineer.
Hydraulics & Refrigeration
Pascal’s law — pressure applied to a confined fluid is transmitted equally in all directions — is the principle behind every hydraulic press, brake system, and lifting platform. Our Pascal’s Law simulator lets you experiment with piston sizes to understand force multiplication and mechanical advantage. The Refrigeration Cycle simulator models the vapour compression cycle used in refrigerators and air conditioners, with a P-h diagram, COP calculations, and four different refrigerants to compare environmental and performance trade-offs.
Who Uses These Simulators?
These tools serve engineering students studying mechanical and electrical engineering, university undergraduates in thermodynamics and fluid mechanics courses, instructors preparing demonstrations, and working engineers who need quick reference calculations. The interactive approach — adjusting parameters and seeing immediate visual feedback — bridges the gap between textbook theory and practical understanding, all without requiring expensive laboratory equipment or professional simulation software.
Internal Combustion Engines
Internal combustion engines convert chemical energy into mechanical work through controlled combustion inside cylinders. The Four Stroke Engine Simulator animates the intake, compression, power, and exhaust strokes for both Otto (spark-ignition) and Diesel (compression-ignition) cycles, displaying real-time PV diagrams, valve timing events, and thermal efficiency calculations. The Two Stroke Engine Simulator demonstrates port timing, crankcase compression, and scavenging in a simpler two-stroke cycle. Students can compare the power delivery, efficiency, and emissions trade-offs between two-stroke and four-stroke designs — essential knowledge for automotive, marine, and small-engine applications.
Gas Laws & Thermodynamic Properties
The behaviour of gases underpins all thermodynamic analysis. The Boyle’s Law Simulator demonstrates PV = constant with an animated piston-cylinder and gas particles tracing the isothermal hyperbola. The Charles’ Law Simulator shows isobaric expansion where V/T = constant, including extrapolation to absolute zero. The Ideal Gas Law Simulator unifies these relationships as PV = nRT, covering isothermal, isobaric, and isochoric processes with animated molecular motion. The Specific Heat Capacity simulator visualises Q = mcΔT by comparing how six materials heat at different rates. The Thermal Expansion Calculator computes linear expansion, shrink-fit interference, and bimetallic strip deflection for ten engineering materials — critical for piping design, precision fits, and temperature compensation.
Explore Other Categories
Beyond thermal and fluid engineering, explore our Mechanics & Motion simulators for force and motion fundamentals, Strength of Materials simulators for stress analysis and structural design, and Basic Electrical simulators for circuit analysis and motor characteristics.