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Symetric planes
Hello, When meshing a half model (fuselage + wing) using a symmetry plane, is it necessary to project a CCS curve onto the symmetry plane ? Thanks !
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OpenVSP and FlightStream
Hello, What are the main use cases and advantages of using OpenVSP before setting up a simulation in FlightStream ?
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External Software to mesh
Hello, If a part of my geometry is meshed using external software, what key aspects should be carefully considered ? Thanks !
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Meshing complex bluff bodies
Hello, What is the recommended approach for meshing complex non-lifting geometries such as a rotor hub? Is the TFI mesher appropriate for this type of geometry? Or an external software ? Thanks !
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Meshing the fuselage - wing Area
When merging meshes from two components (e.g., wing–fuselage junction), what are the best practices to ensure a proper connection? How should differences in mesh resolution be handled (e.g., finer mesh on the wing than on the fuselage)? Is it problematic to have highly stretched or anisotropic cells in this region? (like…
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Rotor / hub meshing best practise
Hello, What are the best practices for modeling the rotor hub–blade connection in transient simulations? Should a gap be introduced between the blades and the hub? Is it preferable to remove the hub entirely? Or should a gap be defined between the hub and the fixed geometry while allowing the hub to rotate? Thanks !
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How to access to the FlightStream Youtube Tutorial Videos?
Hi everybody, Could somebody share the tutorial videos that were hosted in Youtube? I recently tried to watch one but the FlightStream account in YouTube was closed. I find these videos extremely helpful, especially since I'm working with undergrad students that are working with FlightStream for the first time. Do someone…
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Pressure contour computed with FlightStream for ONERA M6 wing case
Hi, I tried to load the surface mesh from CFD which is in PLOT3D format. And I ran the case M=0.84, AoA = 3.06 deg with the transonic field panel method. I just ran the case without boundary-layer coupling. The pressure contour does show the Lambda-type shockwave. The surface grid is attached. Not sure whether you can…
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FlightStream Error: GlobalZoneEU Feature Not Found
Hello, I am getting a checkout failure for FlightStream. My Altair License Utility shows that I am "Authorized to use Managed Licensing", but when I launch the app, I get Error Code 9 and Error Code -40 stating that the feature GlobalZoneEU cannot be found at 6200@localhost . I am a student user. I have tried following the…
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Flightstream：Why does the reference velocity have such a large impact on the calculation result Fx?
Dear When I simulated the propeller, the thrust varied significantly with the reference velocity. When I set the velocity to be the same as the free flow velocity, the thrust was smaller than the simulated value. Another issue was that as J increased, the thrust did not decrease as expected, but instead increased.
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Need help with transferring and re-transferring license
Hi, I have a question about my Flightstream Student Edition license. The laptop where I originally installed Flightstream is currently being repaired but I didn't know that I was supposed to deactivate the license first before trying to activate it on another laptop. Is it possible for you to help me with this? Also, I'm…
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How do i model a split flap for a wing in FlightStream correctly?
Hello, i want to simulate a wing with extended split flap on the bottom surface of the wing. I need help in finding the best strategy to set up the simulation in FlightStream. I am not sure what to declare as a base flow region. Its obvious that the blunt trailing edge of the wing and the flap are both base regions but i…
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is coupling between flightstream and Hyperstudy possible for automating the design process?
Hello, I want to explore the feasibility of handling an area rule process using Flighstream. Also coupling between flightstream and Hyperstudy for automating the design process. Please suggest or share relevent material if it is possible.
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FlightStream - Incorrect Moment Coefficients
Hi, I am working on a student project using FlightStream to obtain a full set of stability derivatives for a light GA aircraft, similar in configuration to a Cessna 172. I have been able to produce good results for lift, drag, and side force derivatives, but the pitching, rolling and yawing moments and their associated…
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FlightStream License checkout failed
I'm getting a license error every time I open FlightStream. Please find the attached image. I have tried reinstalling FlightStream, and it did not help. Altair says my license key is still active. Can you please help me fix this error?
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Question about Mesh Convergence for Rotor Geometry
According to the manual, it is recommended to run the analysis with a non-zero angle of attack. For rotors, would it be appropriate to use geometries with varying collective pitch angles for this purpose? Also, in OpenVSP’s detailed settings, the manual mentions setting the clustering values for the leading edge and…
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FlightStream - CCS Wing Meshing Growth Controls Being Ignored
Hi, I have been using the CCS wing meshing tool in FlightStream to create the wings and horizontal/vertical stabiliser for a light aircraft. The mesher works fine without control surfaces, but the moment I specify a control surface it seems to ignore any growth scheme settings. For example, this wing has 160 chordwise…
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Axial Mesh refinement on a fuselage component
I am having problems to refine the mesh on a fuselage component in the axial direction, in the user manual it seems to be possible to do it but the mesh refinement zone tool is only available in the CCS wing tool. Furthermore, i saw that it is possible to use the wrapper tool to refine mesh but it deteriorates the global…
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Inquiry Regarding Tessellation Control in OpenVSP
According to the FlightStream manual, when exporting a rotor from OpenVSP, the values for LE Clustering and TE Clustering should be set to 1. However, there is no specific guidance on how to set the Root Cluster and Tip Cluster values. I would like to inquire about the recommended settings for these parameters.
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FlightStream Publications
This discussion is a running list of FlightStream publications. Our team will routinely update this thread. If you are unsure whether an investigation of interest is available, please reach out to our team directly. Little, D. S., Majdalani, J., Hartfield, R. J., & Ahuja, V. (2025). Improved prediction of propeller tonal…
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Community Champion of the Month - July, 2025
The Community Team would like to introduce the July Champion of the Month, Dr. Luca Cavagna @Luca Cavagna who has vast experience as an aerospace engineer in the field of aeroelasticity , flight/ground loads and simulation. Luca Cavagna graduated in 1998 from Politecnico di Milano in Aerospace Engineering with a thesis on…
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Can I use reliably Altair products to simulate CFD on extreme flight conditions?
Description: Usage and limitations of Hypermesh and FlightStream for specific flight conditions in CFD analysis Product/Topic Name : Hypermesh, Hypermesh CFD, Hyperworks, FlightStream Hi everyone! My team is having difficulties evaluating the options with Altair softwares on CFD analysis on specific flight conditions. We…
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flight stream에서 로터의 FM 관련 문의
현재 openvsp에서 모델링을 한 로터를 이용하여 .p3d 파일로 flightstream의 solver를 이용해서 로터의 FM을 계산해보고 있습니다. 그런데 메뉴얼에 나와있는 대로 mesh를 구성하였지만, 원하는 FM의 값에 다가가지 못하고있습니다. 다양한 mesh를 이용하여 계산해본 결과, 모멘트의 값이 너무 크게 나오는 결과가 지속적으로 나타나고있습니다. 그리고 mesh에 따라 모멘트(Moment_Z)와 추력(Force_Z)의 값이 너무 큰 변동이 있는것을 알았습니다. 파워를 계산함에 있어, 모멘트와 각속도를 곱하면서 계산하고 있는데, 모멘트의 값을 설정하는 변수가…
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FlightStream License Error – GlobalZoneAM Feature Not Found (Error Code 9)
Hi, I’m getting the following license error when launching FlightStream: The Altair License Manager is running, and the license file is in the expected location. I also tried restarting the service, but the error still shows up. Does this mean the license doesn’t include the GlobalZoneAM feature, or is there something else…
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M2Cn distribution 질문
안녕하세요 충남대학교 석사과정 박기정입니다. 몇 가지 질문이 있습니다. 1 . 1 time step run한 후 Export 했을 때 지정한 블레이드 단면들에 대한 X, Y, Z, nx, ny, nz, L, Cp, Mach, vx, vy, vz, vtot, Cp_ref 값이 여러 개 (Edges = 60, 이때 데이터 60개 추출) 나오는데 어떠한 값을 사용해야 근거 있는 데이터값을 얻을 수 있을까요? surface cross section에서 section plane : XZ, Plot direction : X를 사용했습니다. 2. 지정한 블레이드 단면들에 대한 X, Y,…