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Doubt regarding flightstream, why are my Cl values this unrealistic?
Hey everyone, I tried to simulate flow around a 777 generated from VSP, I did all the steps properly, like uniting, removing all degenerate faces, marking all trailing edges and wake termination nodes, but my simulation still isnt working. I also did proper meshing according to this vide - FlightStream Tutorial: OpenVSP to…
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Applying the Polhamus Vortex Lift Correction to Altair FlightStream
Background In aerodynamic design, particularly for aircraft with delta or highly swept wings, accurate lift prediction is not just a convenience; it’s a necessity. At high angles of attack, traditional linear lift models fail to capture a critical phenomenon: vortex lift. This blog post explores vortex lift correction,…
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FlightStream Self Paced Training Presentation
The FlightStream Self-Paced Training Presentation is a comprehensive resource designed to help users of all experience levels master aerodynamic simulation at their own pace. This training covers everything from the basics of FlightStream, including its interface and physics theory, to advanced topics like multi-body…
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FlightStream Tutorial Models and Files
Overview: These are a set of files available for use to explore and understand the capabilities of Altair FlightStream. There are help Youtube videos that go along with these models. Included in the zip file are: Files: 777ER.vsp3 Blunt_TE_original.p3d Boeing 757S.STL…
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How to make Flightstream recognize my active student license?
I have completed all the steps to download Flightstream and to activate my student license in the system, according to a video tutorial. However, as I launch the app, I come across this error: License checkout…not found. Any idea how to solve it?
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Discrepancy between FlightStream 2023 and FlightStream 2025 results
I have plots between the two versions where the drag is close to doubled in 2025 compared to the 2023 results.
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Getting License error for FlightStream
After launching the FlightStream Application i am getting license not found error , but i have installed the license and authenticated it still im getting such error. I have attached error screenshot and license screenshot. Kindly help me out
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FlightStream, student license issue
Hello, I have an issue regarding the student licensing of the FlightStream program. After reading the installation documentation, I understand that there is a need for a license file which I currently don't have. Could you tell me how can I get a student license file? I attached a photo of the installation process where…
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Why is my Flightstream ground-plane unsteady simulation not converging?
Hello, I'm trying to model a vehicle in hover and cannot get the solution to converge. If you could shed some light on why the solution is not converging, it would help a lot. What I have tried: Tried a single propeller without ground (viscous and inviscid) and it works. Tried two propellers and without ground, and it…
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FlightStream 2025 (Windows) crashing on all unsteady simulations
Hello, I have an issue where FlightStream 2025 crashes every time I run an unsteady simulation. I did not have this issue with the 2023 version. I have a Windows machine with 64gb of RAM and 32 parallel threads. I have tried running the same simulation on a Linux machine and it works fine. I have tried uninstalling and…
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How to dowload the extension for hypermesh to export to flighstream (fixed)
I recently saw a video showing a extension that allows a obj export from hypermesh to flightstream, but once i click the link to download the extension there is no place for me to dowload just a text with the explanation of the extension. the link is in this message. it was corrected thanks to all!
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FlightStream: How to model imperiable ground plane
Hello, I'm using Flightstream for my PhD and was trying to model an unsteady simulation with the airframe in hover. But the propeller wake passes through the ground plane rather than bouncing off the ground plane. I'm not sure how to make the ground plane impermeable. Do you know how to fix this issue? Thanks
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Automating FlightStream Using Terminal Interfacing
Hi there, I am working on automating some analysis using FlightStream, and part of this involves running meshes that I cannot test manually to see if they will produce converging results during FlightStream analysis. Within this automation, I would like to be able to check up on the status of the FlightStream analysis by…
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CFD/FlightStream help?
Hello I'm using FlightStream to do the CFD of a wing, the problem is that more than once the solver does this **** and I don't know how to avoid it. Can someone help me?
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FlightStream Scripting Spreadsheet Export Yields Wrong Binary Format
While writing some scripts for automating analysis, I have discovered that when I use the command: """EXPORT_SOLVER_ANALYSIS_SPREADSHEET (path)""" The resulting text file data is saved in UTF-8, but the file is encoded as UTF-16. This results in garbage data when opened by a standard text editor. I can get around this by…
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FlightStream installer
Is there an installer available for FlightStream? The marketplace download just has an executable that runs the application, which is not suitable for an enterprise environment. We have the need to install FlightStream on lab machines where multiple users may login to use the software, so ideally there would be an msi or…
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Fuselage C_L values are greater than the wing (Beginner at CFD)
For Reference, This Is A School Group Project I initially had trouble getting the model initiated through the solver. After reworking the model in SolidWorks to close all gaps and turning an assembly into a single part, simulations ran better than before. I set the values of the reference length as the length of the entire…
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Hello World from FlightStream Team!
Welcome to the Altair FlightStream community forum! We are excited to launch this space for everyone involved in the world of computational aerodynamics and simulation to come together, share insights, and collaborate. Whether you're a seasoned FlightStream user or just getting started, this forum is designed for you.…
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FlightStreamハンズオン演習
始めに FlightStream については、次の動画記事で紹介をしています。 https://community.altair.com/community/ja?id=kb_article_view&sysparm_article=KB0124927 しかし、実際にどのような製品であるのか、簡単と言っているがどの程度簡単なのか、そういったことを把握するには、実際にソフトを使って体感してみるのが一番だと、私は思います。 そこで 10~20 分ほどで、FlightStream がどのようなソフトであるのかを体感できる、ハンズオン演習書を準備しました。ぜひ一度 FlightStream…
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FlightStream で解いた流体の圧力を、HyperMesh で構造モデルにマッピングする方法
始めに 本記事では、解析実施済みの FlightStream モデルから、次のような圧力場 (X,Y,Z 座標と圧力値) の csv ファイルを出力し、 このように HyperMesh 上で構造解析モデルにマッピングする方法を、動画で説明します。 動画による説明 動画ファイル .mp4 のダウンロード: KB0124944_FlightStreamの流体圧力をHyperMeshで構造モデルにマッピングする方法.mp4 動画で使ったファイルのダウンロード: example01.7z
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FlightStream のご紹介
始めに FlightStream は境界要素法による流体ソルバーです。流体の内部にメッシュを切る必要がないため、非常に短い時間でモデルの準備ができて、手軽に流体特性の評価ができます。どのようなことができるのか動画で説明しているので、ぜびご覧ください。 動画 動画ファイル .mp4 のダウンロード KB0124927_FlightStreamのご紹介.mp4