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Timestep size & Max Stagger Iterations
Hello everyone, 1. For vortex shedding simulation (transient), how should I know if my max stagger iterations value is 'enough' or not? what is the good starting value of max stagger iterations. 2. For example: my timestep size is 0.002 + max stagger iterations = 10, if i want to decrease my timestep size to 0.001, should…
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How to more easily export AcuProbe results from multiple simulations of SimLab? Also, what kind of r
Hello experts, I've been running a large number of simulations in SimLab and need to export the AcuProbe results for each one. Currently, I have to open the log of each simulation and manually export the results, which takes me around 2 hours or more just for this task. Here you can see a folder showing a quarter of the…
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How to choose the Boundary Layer Thickness, Boundary Layer Mesh and No of Boundary Layer in CFD
Hi, I Performing a CFD analysis for an Air blower Model. Here I meshed Model with some Element size and Tetra 3d Mesh Type. But here How to choose the Boundary layer mesh Size, No of layer and thickness.
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Why is the section plane moving in visualization mode (Post) ?
I have an issue related to the visualization of a CFD analysis. When I put a section plane and animate it, it moves, instead of showing the movement "inside" of it. Such as the current movement as the time passes. Before, when I was studying an individual piece it would let me, but now I have this big cluster of pieces and…
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What does it mean by checking arguments?
Trying to simulate flow through an accumulator, I'm not sure if this means my set up is wrong, but any help would be appreciated.
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How to fix this acusolve error?
I am using simlab and acusolve to measure air flow through an accumulator. The mesh is created ( as you can see) but for some reason I get this message when I try to update the study. Any idea what I did wrong or how to get around this?
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I need help with my airfoil simulation
Hi guys, so im trying to simulate the diffeences between the same profile (intact vs impacted but not with a hole) at different Angles of attack I'll attach all the pictures of mesh and run parameters +log. Some ppl before told me to get a even finer mesh so i runned this imulation that took me 8 hours (i think is too much…
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How to apply constant temperature boundary condition to a volume?
Hello experts, I'm trying to perform steady state conjugate heat transfer analysis where I want specify constant temperature a solid volume and study its impact on the surroundings. I am requesting your support with this. Thanks and Regards, Jagan
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Automation with few parameters
Hi experts! I am trying to automate few simulations with different inputs. I am trying to do with a geometry from de tutorial: "Mixing Elbow". This geometry has two velocity inlets that i want to change in each simulation. My excel table is something like this: ID VEL_LONG VEL_SMALL 412 0.4 1.2 512 0.5 1.2 612 0.6 1.2 413…
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Issue on running Solver Job Launcher
Hi, for your information, my university is using Altair hyperworks desktop 2022 for Computer Aided Engineering for teaching. Recently I was assigned to run Acusolve to analyse an air duct, but my Acusolve does not auto run AcuProbe and AcuTail, results that I cannot review my result. Can anyone assist me on this issue ?…
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UDF for body force
Hello, I found that there was an issue to apply gravitational force (x, y, z) from test data. (simlab 2024) Multiplier function support only 1 direction of time-dependent data. (2 column array, time versus data). I was trying to use momentum source command (it support 4 column array). However, time variable was not…
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Convert results from HyperMesh CFD to Ensight or x3d
Hi experts! I am trying to convert the results that HyperMesh gave me to the ensight format or .x3d. I have seen that ther is a tool to make it called 'acuTrans' that is to translate the AcuSolve solution output to other formats and I have put on AcuSolve this line acuTrans -pb ACU-T1000_Manifold.1.Log -to ensight but it…
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Wall boundary condition in AcuTrace
Hi, experts. In the analysis results (animation) by acutrace of the tutorial ACU-T: 6000 Static mixer, the particles do not appear to be reflected by the wall set as the reflecting wall. Even in my own model (analysis of particle behavior in a tank filled with water in a single-phase flow), reflection does not occur on the…
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Problem executing acuRun
Hi experts! I'm trying to execute the example of the step-by-step ACU-T1000_manifold in acuSolve cmd prompt. The sentence that i have put on it is the following: acuRun -np 4 -inp ACU-T1000_manifold.inp The response: acuRun: ***ERROR: undefined problem I have copied the acuSolve.exe and acuRun.bat to the working directory…
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Streamline of particles in AcuTrace
Hi, experts. I understand that in order to plot particle trajectories (streamline) as the analysis results of AcuTrace, it is necessary to obtain streamline data, as described on the page at the following URL. I have the following questions regarding this.…
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2nd order time integration
Hi everyone, Is 2nd order time integration sensitive to CFL Number? Does user need to set CFL < 1 if using 2nd order?
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I need help with my model. Is it legit?
Hi i need to run cfd and extract Cl Cd in diffrerent AoA. I'll attack all files (mesh, log). This is my volume (chord is 1.56m and span is 0.143m) (aoa 0, vel 108.611 m/s) Ill now attach the mesh condition specified + Now everithing seems fine till i plot Cp/chord. Crazy plts happens also when i plot lift and drag i have…
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The settings for AcuTrace
Thank you for your assistance. I have the following four questions. (1) I performed a fluid analysis in AcuSolve (single-phase flow, fluid: water, turbulence) in Transient mode for 60 seconds in 0.01 second increments, and in AcuTrace, I set Max time=0 and Flow field type=Static in Setup to give a steady flow field using…
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FSI Analysis (Opristruct - Acusolve) - 3D analysis with structural shell mesh
I would like to perform a fluid-structure interaction (FSI) analysis on a thin metal plate subjected to fluid flow. Since the plate has a thin geometry, I plan to model it using a 2D shell mesh to reduce computational complexity, especially in terms of resolving the plate's thickness. My goal is to maintain the fluid…
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Solar panel deflection due to wind!
Outlook: * Inspire CAD to genereate model. Simlab meshing and solution set-up in easy GUI for CFD and Structural analysis. * Mapped pressure from CFD to Structure. This results can be used to evaluate the structure and improve the design of the panel. This article includes: * 1 Inspire model with the solar panel.* Altair…
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Issues with irradiance in mesh independence analysis for CFD simulation coupled with solar radiation
Hello experts! I am performing a mesh independence analysis for a CFD simulation coupled with solar radiation. I had understood that solar radiation should be independent of the mesh size, but my results suggest otherwise. With a large element size (1.3 m), the distribution of solar radiation looks correct without issues,…
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How to set the convergence criteria
Hi, experts. In the echo file, there are the following items for convergence criteria settings, but what value does the "standard" setting refer to? Specifically, where is the value that corresponds to Standard set? Can it be set in HyperWorks CFD? Also, in HyperWorks CFD, what kind of parameter convergence is being…
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The calculation process for the residual ratio and solution ratio
Hi, experts. What process is used by the system to calculate "Residual ratio" and "Solution ratio" listed on the web page below? https://2023.help.altair.com/2023/hwdesktop/cfd/topics/pre_processing/solution/plot_run_time_data_t.htm If the model is three-dimensional, the residual ratio and solution ratio are calculated not…
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Items in the end file output by AcuTrace
Hi, experts. The items that are output in the end file are summarized on the following web page. https://help.altair.com/hwcfdsolvers/acusolve/topics/acusolve/post_processing_programs_acutranstrace.htm Of these items, could you please explain in detail the difference between "ElmId" and "ElemId"? Specifically, I would like…
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Monitor data
Hi, experts. I have two questions: (1) and (2) (1) When I tried to output the Surfaces and Volumes data in Solution > Monitors in HyperWorks CFD using AcuTrans, the following error was displayed. Could you please tell me the cause of this and how to solve it? acuTrans: *** ERROR: Surface_integral_output_vars…