Ask
Open the Chat panel and describe the analysis. Name the circuit, net, part, or assembly, the conditions, and the result you need.
Example: “Simulate the airflow and the temperature inside this enclosure with the fan at full speed.”
Hardware Simulation Software: Circuits, Boards, and Mechanical Parts
Flux is an AI hardware engineer. Ask it to simulate your circuit, your routed board, the air in your enclosure, or the load on a bracket. Flux sets up the simulation from your project, runs it, and returns the plots and values in the chat.
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How simulation works in Flux
Run
Flux sets up the simulation from your project data and runs it. You get plots and values with units and locations.
Example: “Analyze the USB differential pair on this board. Report its impedance, crosstalk, and eye diagram.”
Compare
Change the design and run the same analysis again. Ask Flux to compare the results and explain how the values and plots changed.
Example: “Compare the deflection of the old bracket and the new bracket with the same load.”
What you can simulate in Flux
Circuit simulation (SPICE)
Run SPICE simulations on the schematic in your project or on a circuit you describe. Flux returns operating points, AC and DC sweeps, transient waveforms, and frequency response.
Example: “Run an AC sweep of the output filter in this schematic from 10 Hz to 1 MHz. Plot the output gain and phase.”
Electromagnetic and RF simulation
Analyze routed copper and antennas. Flux reports S-parameters, impedance, time-domain reflectometry, field maps, and the gain, efficiency, and radiation pattern of an antenna.
Example: “Simulate the antenna feed on this board at 2.45 GHz and report S11.”
Signal and power integrity
Check high-speed pairs for impedance, crosstalk, and eye diagrams. Analyze the power delivery network for PDN impedance, IR drop, and plane resonance, and let Flux select the decoupling capacitors.
Example: “Choose decoupling capacitors for a 50 mΩ target impedance on the 1.2 V rail.”
PCB thermal simulation
Give Flux the operating conditions, or the power of each component. Flux calculates the component powers from the datasheets and returns component temperatures and a heat map of the board.
Example: “Estimate PCB temperatures at 12 V input and 1.5 A load. Show component temperatures and the heat map.”
Stress and mechanical analysis
Analyze stress, deflection, and heat conduction in a part or an assembly. Flux also checks fit and clearance and calculates mass, center of mass, and inertia.
Example: “Analyze the deflection and stress in this bracket under a 40 N load. Use 6061-T6 aluminum and report the peak values with their locations.”
Airflow and liquid cooling simulation
Simulate air flow and heat transfer inside an enclosure, around a board, or around a product. Include vents, fans, and heatsinks, or describe a cold plate for liquid cooling. Flux reports peak temperatures, flow rates, and pressure drops.
Example: “Simulate the airflow and the temperature inside this enclosure with the fan at full speed and the vents on the side wall.”
Power, battery, and motor analysis
Calculate a power budget for each rail. Get the voltage under load, C-rate, run time, and heat of a battery pack. Size a motor and gearbox, and check the motor driver on the board.
Example: “Estimate the run time of a 2S 18650 pack for this robot's load profile. Report voltage sag, C-rate, and pack temperature rise.”
Robot motion and drone flight
Check the reach, self-collision, and joint loads of a robot, or simulate its motion with physics. Simulate the hover, forward flight, endurance, and gust response of a drone or aircraft.
Example: “Check the reach and peak joint torques of this robot arm with a 2 kg payload.”
Why simulate in Flux
Uses your project data
Flux reads the schematic, the routed board, the stackup, and the 3D parts from your project. You do not export or rebuild the model.
Electronics and mechanical in one place
Simulate the board, the enclosure, and the moving parts of the same device, in the same project.
Compare every change
Run the same analysis after a design change and ask Flux to explain what changed.
Bring your measurements
Upload Touchstone S-parameter files from a measurement or a vendor, and compare them with the simulated board.
Checks before you order
Flux checks the design with simulation and design rule checks before your engineers review it and order the parts.
Part of your Flux plan
Your Flux plan includes the editor, mechanical CAD, parts data, simulation, and manufacturing files.
Why engineers switch to Flux
Loved by engineers pushing hardware design forward.
"As a startup founder building an IoT device for construction machinery, I took my product from concept to production entirely in Flux with no external EE help. We even raised $187K on Indiegogo. Flux made it possible."
Tim Wagner
Founder of DirtyDevices
"Next-Generation EDA; Absolutely phenomenal support and design experience. Added value with the post-design reviews before manufacturing"
Nabhan Fakrudin
PhD researcher in CTS
"Flux with its AI will enable more people to design their own hardware. Seeed is gladly joining the efforts by bringing the latest open hardware designs to Flux public library!"
Eric Pan
Founder and CEO of Seeed Studio
Frequently Asked Questions
Flux simulates circuits with SPICE, the electromagnetic and RF behavior of routed boards, signal and power integrity, PCB temperatures, and air and liquid flow. It analyzes stress, deflection, and heat conduction in mechanical parts, calculates power budgets, batteries, and motors, and simulates robot motion and drone flight.
Open the Chat panel in your project and describe the analysis you need. Flux uses the schematic, board, and 3D parts in your project, and asks for missing values.
Yes. Flux runs SPICE on the schematic in your project or on a circuit you describe. It returns operating points, AC and DC sweeps, transient waveforms, and plots of voltage, current, gain, and ripple.
Yes. Flux analyzes routed traces and differential pairs. It reports impedance, S-parameters, crosstalk, TDR response, and eye diagrams at the bit rate you specify.
Yes. Give Flux the material, the loads, and the supports. Flux reports stress, deflection, or temperature values with units and locations.
Yes. Flux simulates natural or forced convection with vents, fans, and heatsinks, and liquid cooling in cold plates and channels. It reports peak and outlet temperatures, flow rates, and pressure drops.
Yes. Upload Touchstone files (.s1p, .s2p, .s4p). Flux can plot them, convert them to impedance or time-domain response, de-embed fixtures, and compare them with the simulated board.
Run the same analysis again with the same values, loads, and boundary conditions. Ask Flux to compare the results and explain how the values and plots changed.