Engineer Simulates Rocket Nozzle Airflow Using Just 150 Lines of Python

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A developer has demonstrated how a de Laval rocket nozzle can be simulated using approximately 150 lines of Python code. The de Laval nozzle features a converging section, a narrow throat, and a diverging section that together convert high-pressure thermal energy into directed kinetic energy. The simulation visualizes how exhaust gas crawls slowly through the chamber, accelerates sharply at the throat, and reaches supersonic speeds as the nozzle widens. This behavior is governed by the area-velocity relation, which shows that subsonic flow speeds up when a channel narrows, while supersonic flow speeds up when it widens. The project serves as an accessible, code-based illustration of core compressible flow principles from aerospace engineering.

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Developer Builds Browser Game Collection to Kill Time at Work

A developer has created TapWhenBored, a small collection of browser-based casual games designed for quick breaks. One of its featured games, Marble Nostalgia, is a digital take on the classic marble solitaire board game where players must eliminate marbles by jumping over them. The goal is to leave just one marble remaining on the board, a feat no player has achieved so far. The developer has set up a leaderboard to track player progress toward that milestone. The project includes several other casual games beyond Marble Nostalgia and is open for anyone to try.

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ProgrammingDEV Community ·

Hardcoded Zero in Append-Only Log Silently Masqueraded as Real Measurement

A developer discovered that a log entry reading 'OK_ATOMS atoms=0 top=0 bot=0' was never a real measurement — it was a string literal written as a placeholder while the actual counter was still being built. Because zero is a legitimate result in real runs, the hardcoded line was indistinguishable from genuine output, allowing it to pass unnoticed through parsers and downstream systems. The append-only nature of the log meant the false record could not be deleted, requiring a superseding entry to correct it. The author argues that any log line resembling a measurement must actually originate from one, and suggests using an unambiguous error or a non-numeric sentinel value like 'reason=census_not_wired' as a placeholder instead. A simple audit — checking for log print statements whose numeric fields are literals rather than variables — can help identify lines that will never reflect real changes in underlying data.

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ProgrammingDEV Community ·

Beginner's Guide to Building Your First ASP.NET Web Service

A new tutorial on DEV Community walks beginners through setting up their first ASP.NET web service using .NET 10 and either Visual Studio or JetBrains Rider. The guide starts by stripping down the default project template to a minimal configuration, keeping only the core application builder setup. It then introduces Scalar, a lightweight API testing tool added via a NuGet package, to replace the default weather forecast boilerplate. Developers are shown how to register Scalar in the development pipeline and write a basic GET endpoint that returns 'Hello World'. The tutorial is the first in a series that will later cover controllers, dependency injection, databases, and clean architecture.

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ProgrammingDEV Community ·

How to Dual-Boot Linux Mint 22.3 Cinnamon Alongside Windows 11

A step-by-step guide outlines how to install Linux Mint 22.3 Cinnamon edition on a Windows 11 machine while keeping Secure Boot and BitLocker enabled. The process begins with downloading Linux Mint and the Rufus tool to flash the OS onto a USB drive. Users must then create a dedicated disk partition via Windows Disk Management before rebooting into the boot menu to launch the Linux Mint installer. During installation, the guide recommends manually allocating the free partition by splitting it into separate root and home directories. Following these steps allows users to run both operating systems on the same device without disabling key Windows security features.

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