# Using SimScale **URL:** https://www.simscale.com/forum/c/using-simscale/8.md [Latest](https://www.simscale.com/forum/latest.md) · [Categories](https://www.simscale.com/forum/categories.md) --- ## [About the Using SimScale category](https://www.simscale.com/forum/t/about-the-using-simscale-category/31)
**Author:** [@anon4307278](https://www.simscale.com/forum/u/anon4307278)\ **Replies:** 0\ **Last updated:** [July 2, 2015, 5:20pm UTC](https://www.simscale.com/forum/t/about-the-using-simscale-category/31 "2015-07-02T17:20:43Z")
Address your how to questions regarding using SimScale directly in one of the subcategories CAD & Meshing Solid Mechanics / FEA Fluid Flow / CFD Thermal Acoustics Particles --- ## [Radiation and natural convection in a sealed double-glazed cavity: how do you set it up?](https://www.simscale.com/forum/t/radiation-and-natural-convection-in-a-sealed-double-glazed-cavity-how-do-you-set-it-up/101398)
**Author:** [@marcomaesgs1](https://www.simscale.com/forum/u/marcomaesgs1)\ **Replies:** 1\ **Last updated:** [October 23, 2026, 9:37am UTC](https://www.simscale.com/forum/t/radiation-and-natural-convection-in-a-sealed-double-glazed-cavity-how-do-you-set-it-up/101398 "2026-10-23T09:37:12Z")
Hi all, I’m modeling heat transfer through a double-glazed unit, about \[24 mm\] overall with a \[12 mm\] gas-filled cavity, to estimate center-of-glass heat flux. I’d like to capture both natural convection in the cavity a… --- ## [Downloading issues](https://www.simscale.com/forum/t/downloading-issues/101397)
**Author:** [@chazijian](https://www.simscale.com/forum/u/chazijian)\ **Replies:** 0\ **Last updated:** [October 15, 2026, 2:16pm UTC](https://www.simscale.com/forum/t/downloading-issues/101397 "2026-10-15T14:16:04Z")
Hi everyone, I’m running a steady-state incompressible case (SIMPLE, k-omega SST, ~15.3 M cells, four meanVelocityForce momentum sources) and I’ve hit a wall with downloading results, so I’d appreciate any advice. The … --- ## [Meshing error](https://www.simscale.com/forum/t/meshing-error/101388)
**Author:** [@upasse](https://www.simscale.com/forum/u/upasse)\ **Replies:** 0\ **Last updated:** [October 8, 2026, 4:52pm UTC](https://www.simscale.com/forum/t/meshing-error/101388 "2026-10-08T16:52:21Z")
Run 2 Velocity field started diverging to a value of 1.10082e+07 m/s near the position: (27.09, 26.69, -2.818). Please check the mesh quality near the reported location and try refining the mesh. If the problem occurre… --- ## [Creating inner flow volume](https://www.simscale.com/forum/t/creating-inner-flow-volume/101387)
**Author:** [@upasse](https://www.simscale.com/forum/u/upasse)\ **Replies:** 0\ **Last updated:** [October 7, 2026, 10:15pm UTC](https://www.simscale.com/forum/t/creating-inner-flow-volume/101387 "2026-10-07T22:15:16Z")
Hello I want to created an inner flow volume with this Rhino model, the instruction are not clear how and why this does not work, can someone send me a visual example what I need to change? I have two boxes with inner v… --- ## [Incompressible CFD workflow unavailable on metric fluid-only geometry](https://www.simscale.com/forum/t/incompressible-cfd-workflow-unavailable-on-metric-fluid-only-geometry/101380)
**Author:** [@Bjkadb](https://www.simscale.com/forum/u/Bjkadb)\ **Replies:** 0\ **Last updated:** [October 7, 2026, 1:45pm UTC](https://www.simscale.com/forum/t/incompressible-cfd-workflow-unavailable-on-metric-fluid-only-geometry/101380 "2026-10-07T13:45:01Z")
I am trying to set up a steady external-airflow case in this public SimScale project: https://www.simscale.com/projects/Bjkadb/akjbdba\_593241773/ The project uses the Boeing 777-300ER STL \`aircraft\_clean.stl\`. I created… --- ## [Issue creating simulation](https://www.simscale.com/forum/t/issue-creating-simulation/101239)
**Author:** [@rommel\_exe](https://www.simscale.com/forum/u/rommel_exe)\ **Replies:** 2\ **Last updated:** [September 24, 2026, 6:59pm UTC](https://www.simscale.com/forum/t/issue-creating-simulation/101239 "2026-09-24T18:59:37Z")
Hi guys, I am trying to run an incompressible simulation on this CAD model: SimScale Login However, each and every time I encounter a different issue. I am new to Simscale so I was wondering if someone could guide me t… --- ## [Tesla Micromixer CFD simulation troubleshooting - incorrect results and distribution](https://www.simscale.com/forum/t/tesla-micromixer-cfd-simulation-troubleshooting-incorrect-results-and-distribution/101218)
**Author:** [@Karakat](https://www.simscale.com/forum/u/Karakat)\ **Replies:** 3\ **Last updated:** [September 24, 2026, 6:45pm UTC](https://www.simscale.com/forum/t/tesla-micromixer-cfd-simulation-troubleshooting-incorrect-results-and-distribution/101218 "2026-09-24T18:45:53Z")
Hello, I am working on a Tesla Micromixer simulation using the Incompressible CFD solver. I have set up everything, but the simulation results in Run 2 look completely incorrect. The contour plots for the Passive Scala… --- ## [external flow selection](https://www.simscale.com/forum/t/external-flow-selection/101233)
**Author:** [@hamdi\_zaherali](https://www.simscale.com/forum/u/hamdi_zaherali)\ **Replies:** 2\ **Last updated:** [September 24, 2026, 6:42pm UTC](https://www.simscale.com/forum/t/external-flow-selection/101233 "2026-09-24T18:42:22Z")
why i can not select the “add geometry operation” when i want to create external flow for my airfoil ? --- ## [Struggling with Meshing on a Complex Geometry](https://www.simscale.com/forum/t/struggling-with-meshing-on-a-complex-geometry/101185)
**Author:** [@pwolf3848](https://www.simscale.com/forum/u/pwolf3848)\ **Replies:** 2\ **Last updated:** [September 24, 2026, 6:31pm UTC](https://www.simscale.com/forum/t/struggling-with-meshing-on-a-complex-geometry/101185 "2026-09-24T18:31:40Z")
Hi everyone, I’m working on a simulation for a new heat sink design and am running into meshing issues. The geometry is fairly complex with many small fins, and the mesh keeps failing near the edges. Here is a link to … --- ## [Innacurate CFD results after changing the angle of attack](https://www.simscale.com/forum/t/innacurate-cfd-results-after-changing-the-angle-of-attack/101328)
**Author:** [@Zhiheng1203](https://www.simscale.com/forum/u/Zhiheng1203)\ **Replies:** 1\ **Last updated:** [September 24, 2026, 6:13pm UTC](https://www.simscale.com/forum/t/innacurate-cfd-results-after-changing-the-angle-of-attack/101328 "2026-09-24T18:13:29Z")
Hello everyone, I recreated the NACA0008 profile based on a dataset from UIUC and the result has a 0.2% error with the theoretical value from Vergas et al. (photo 1), when it is under an aoa of 0 degree, and Re of 2000. … --- ## [Complex Geometry Meshing](https://www.simscale.com/forum/t/complex-geometry-meshing/101289)
**Author:** [@lmw14](https://www.simscale.com/forum/u/lmw14)\ **Replies:** 1\ **Last updated:** [August 24, 2026, 3:50am UTC](https://www.simscale.com/forum/t/complex-geometry-meshing/101289 "2026-08-24T03:50:25Z")
Hi, I have a very complex engine geometry and struggle with generating a mesh. Which settings do I best use for it? Has anyone been at this point and figured it out? --- ## [Combustion Engine Meshing Problems](https://www.simscale.com/forum/t/combustion-engine-meshing-problems/101282)
**Author:** [@lmw14](https://www.simscale.com/forum/u/lmw14)\ **Replies:** 1\ **Last updated:** [August 21, 2026, 3:44pm UTC](https://www.simscale.com/forum/t/combustion-engine-meshing-problems/101282 "2026-08-21T15:44:30Z")
Hi, for my thesis I’m currently creating a conjugate heat transfer simulation. The meshing is not working for my current CAD, because due to the import and translation SimScale itself is generating faults in the model. … --- ## [Handling bolted joint connections in structural FEA — bonded contact vs. modeling real preload?](https://www.simscale.com/forum/t/handling-bolted-joint-connections-in-structural-fea-bonded-contact-vs-modeling-real-preload/101214)
**Author:** [@marcomaesgs1](https://www.simscale.com/forum/u/marcomaesgs1)\ **Replies:** 1\ **Last updated:** [August 11, 2026, 4:20pm UTC](https://www.simscale.com/forum/t/handling-bolted-joint-connections-in-structural-fea-bonded-contact-vs-modeling-real-preload/101214 "2026-08-11T16:20:09Z")
I’m analyzing a bolted assembly and trying to decide how much detail the bolted connections actually need for a trustworthy structural result. The simplifications range from very crude to very expensive, and I’d like to … --- ## [Network Packet Simulation](https://www.simscale.com/forum/t/network-packet-simulation/101267)
**Author:** [@Demo\_ppOx](https://www.simscale.com/forum/u/Demo_ppOx)\ **Replies:** 1\ **Last updated:** [August 11, 2026, 4:10pm UTC](https://www.simscale.com/forum/t/network-packet-simulation/101267 "2026-08-11T16:10:59Z")
Is is possible to use the wind test to try to simulate transmission signals moving through the air? --- ## [Building with perforated roof sheet](https://www.simscale.com/forum/t/building-with-perforated-roof-sheet/101268)
**Author:** [@fjalex](https://www.simscale.com/forum/u/fjalex)\ **Replies:** 1\ **Last updated:** [August 11, 2026, 4:08pm UTC](https://www.simscale.com/forum/t/building-with-perforated-roof-sheet/101268 "2026-08-11T16:08:57Z")
I’m trying to create a simple simulation of a building (box) with a perforated aluminum sheet on top of it (above the ceiling). I need to know the influence of this cover, and the final temperature of the “building” a… --- ## ["An error occurred” after job preparation / Fatal IO Error](https://www.simscale.com/forum/t/an-error-occurred-after-job-preparation-fatal-io-error/101272)
**Author:** [@dhandley](https://www.simscale.com/forum/u/dhandley)\ **Replies:** 1\ **Last updated:** [August 11, 2026, 4:05pm UTC](https://www.simscale.com/forum/t/an-error-occurred-after-job-preparation-fatal-io-error/101272 "2026-08-11T16:05:09Z")
Hi all, I’m very new to SimScale and FEA in general, so I’m hoping someone can point me in the right direction. I’m currently trying to run a static structural analysis of a caravan chassis, mainly to check the chassis… --- ## [Boundary-condition strategy for liquid-cooled LPBF copper cold plates](https://www.simscale.com/forum/t/boundary-condition-strategy-for-liquid-cooled-lpbf-copper-cold-plates/101264)
**Author:** [@6585a0bd203841](https://www.simscale.com/forum/u/6585a0bd203841)\ **Replies:** 1\ **Last updated:** [August 6, 2026, 11:26am UTC](https://www.simscale.com/forum/t/boundary-condition-strategy-for-liquid-cooled-lpbf-copper-cold-plates/101264 "2026-08-06T11:26:52Z")
I am structuring a conjugate heat-transfer model for a liquid-cooled cold plate made by laser powder bed fusion in copper alloy. The internal channels are as-built, so the measured inputs available for correlation are fl… --- ## [Can SimScale compute the natural angular velocity (RPM) of a wind turbine rotor from aerodynamic forces?](https://www.simscale.com/forum/t/can-simscale-compute-the-natural-angular-velocity-rpm-of-a-wind-turbine-rotor-from-aerodynamic-forces/101246)
**Author:** [@Deta22](https://www.simscale.com/forum/u/Deta22)\ **Replies:** 1\ **Last updated:** [August 5, 2026, 2:57pm UTC](https://www.simscale.com/forum/t/can-simscale-compute-the-natural-angular-velocity-rpm-of-a-wind-turbine-rotor-from-aerodynamic-forces/101246 "2026-08-05T14:57:47Z")
Hi SimScale Team, I am working on an academic CFD project involving an Archimedes Screw Wind Turbine (ASWT). My objective is to determine the natural rotational speed (angular velocity/RPM) of the rotor generated by th… --- ## [0% Simulation Progress After 2 Hours](https://www.simscale.com/forum/t/0-simulation-progress-after-2-hours/92436)
**Author:** [@mas985](https://www.simscale.com/forum/u/mas985)\ **Replies:** 7\ **Last updated:** [August 3, 2026, 5:51pm UTC](https://www.simscale.com/forum/t/0-simulation-progress-after-2-hours/92436 "2026-08-03T17:51:36Z")
Something odd is happening with one of my simulations. After 2 hours of run time, 4 core hours, there is still 0% progress, no solver log or any of the other outputs that I normally see when I run a simulation. It is alm… --- ## [Best practices for resolving thin coolant gaps in conjugate heat transfer simulations of battery modules?](https://www.simscale.com/forum/t/best-practices-for-resolving-thin-coolant-gaps-in-conjugate-heat-transfer-simulations-of-battery-modules/101172)
**Author:** [@marcomaesgs1](https://www.simscale.com/forum/u/marcomaesgs1)\ **Replies:** 1\ **Last updated:** [July 9, 2026, 3:16pm UTC](https://www.simscale.com/forum/t/best-practices-for-resolving-thin-coolant-gaps-in-conjugate-heat-transfer-simulations-of-battery-modules/101172 "2026-07-09T15:16:52Z")
I’m setting up a conjugate heat transfer (CHT) simulation of a tightly packed prismatic battery module and running into the classic trade-off between mesh count and resolving the thin fluid gaps between cells and the sol… --- ## [Drag coefficient is unusually low? How to fix this?](https://www.simscale.com/forum/t/drag-coefficient-is-unusually-low-how-to-fix-this/101170)
**Author:** [@yueqian\_jiang](https://www.simscale.com/forum/u/yueqian_jiang)\ **Replies:** 3\ **Last updated:** [July 6, 2026, 2:24pm UTC](https://www.simscale.com/forum/t/drag-coefficient-is-unusually-low-how-to-fix-this/101170 "2026-07-06T14:24:51Z")
I am using CFD to optimizing the geometry of a competitive swim cap (including surface textures and patterns). As a baseline for comparison, I first performed an incompressible water flow simulation around a perfect sphe… --- ## [Why is my simulation wrong? Where was my mistake?](https://www.simscale.com/forum/t/why-is-my-simulation-wrong-where-was-my-mistake/101141)
**Author:** [@timmi](https://www.simscale.com/forum/u/timmi)\ **Replies:** 8\ **Last updated:** [June 28, 2026, 6:25pm UTC](https://www.simscale.com/forum/t/why-is-my-simulation-wrong-where-was-my-mistake/101141 "2026-06-28T18:25:20Z")
Dear Ladies and Gentleman, i started yesterday my new simulation with a new reference body and somehow it didn´t simulate my geometry but the simulation area itself. I will give you a detailed instruction on what I did … --- ## [Missing colored Solution Fields (Velocity ) when simulation is running](https://www.simscale.com/forum/t/missing-colored-solution-fields-velocity-when-simulation-is-running/101037)
**Author:** [@molen\_victor](https://www.simscale.com/forum/u/molen_victor)\ **Replies:** 11\ **Last updated:** [June 27, 2026, 12:05am UTC](https://www.simscale.com/forum/t/missing-colored-solution-fields-velocity-when-simulation-is-running/101037 "2026-06-27T00:05:54Z")
When a simulation is running, in the past I could see the (progression of the Velocity view in Solution Fields). Now I seem not able to view it, see below screen shot: It looks (?) to show the processor regions? I … --- ## [Compressible solver: Negative initial temperature error at low temperatures (216-223K)](https://www.simscale.com/forum/t/compressible-solver-negative-initial-temperature-error-at-low-temperatures-216-223k/101152)
**Author:** [@BraylovesF1](https://www.simscale.com/forum/u/BraylovesF1)\ **Replies:** 2\ **Last updated:** [June 26, 2026, 2:04pm UTC](https://www.simscale.com/forum/t/compressible-solver-negative-initial-temperature-error-at-low-temperatures-216-223k/101152 "2026-06-26T14:04:45Z")
Using the compressible solver at steady state with k-omega SST turbulence model. I am simulating external flow over a delta wing at high altitude conditions. I have tried setting initial conditions, subdomain, and veloc… --- ## [Hydrodynamic focussing multiphase simulation not running](https://www.simscale.com/forum/t/hydrodynamic-focussing-multiphase-simulation-not-running/101125)
**Author:** [@billflan1996](https://www.simscale.com/forum/u/billflan1996)\ **Replies:** 2\ **Last updated:** [June 26, 2026, 1:33pm UTC](https://www.simscale.com/forum/t/hydrodynamic-focussing-multiphase-simulation-not-running/101125 "2026-06-26T13:33:57Z")
Hi all, I am trying to run a a multiphase simulation to model hydrodynamic focussing of a core stream by sheath fluid in a flow cytometry cuvette geometry. I managed to get the simulation to run, but the completion perc… --- ## [How to simulate orbital motion of a permanent magnet rotor?](https://www.simscale.com/forum/t/how-to-simulate-orbital-motion-of-a-permanent-magnet-rotor/100395)
**Author:** [@dbrigi](https://www.simscale.com/forum/u/dbrigi)\ **Replies:** 4\ **Last updated:** [June 26, 2026, 11:52am UTC](https://www.simscale.com/forum/t/how-to-simulate-orbital-motion-of-a-permanent-magnet-rotor/100395 "2026-06-26T11:52:14Z")
Hello everyone, I am trying to simulate a custom permanent magnet generator, but I am stuck trying to define the rotor’s motion. My setup is: - \*\*Stator:\*\* Two Helmholtz coils (100 turns each) connected in series with a … --- ## [Best practices for resolving thin coolant gaps in conjugate heat transfer simulations of battery modules?](https://www.simscale.com/forum/t/best-practices-for-resolving-thin-coolant-gaps-in-conjugate-heat-transfer-simulations-of-battery-modules/101146)
**Author:** [@marcomaesgs1](https://www.simscale.com/forum/u/marcomaesgs1)\ **Replies:** 1\ **Last updated:** [June 24, 2026, 7:37am UTC](https://www.simscale.com/forum/t/best-practices-for-resolving-thin-coolant-gaps-in-conjugate-heat-transfer-simulations-of-battery-modules/101146 "2026-06-24T07:37:13Z")
I’m setting up a conjugate heat transfer (CHT) simulation of a tightly packed prismatic battery module and running into the classic trade-off between mesh count and resolving the thin fluid gaps between cells and the sol… --- ## [SimScale Error When Creating External Flow Volume](https://www.simscale.com/forum/t/simscale-error-when-creating-external-flow-volume/101111)
**Author:** [@jruiz\_gim\_nez](https://www.simscale.com/forum/u/jruiz_gim_nez)\ **Replies:** 2\ **Last updated:** [June 19, 2026, 1:37pm UTC](https://www.simscale.com/forum/t/simscale-error-when-creating-external-flow-volume/101111 "2026-06-19T13:37:40Z")
Hello, good morning. I am currently working on a project to optimize the shark fin area of a race car by varying the yaw angle. After modifying the prototype and cleaning up the geometry to avoid import issues, I encoun… --- ## [CHT – Derived Heat Flux on Inner Cylinder Wall Gives Unrealistically Low Temperatures](https://www.simscale.com/forum/t/cht-derived-heat-flux-on-inner-cylinder-wall-gives-unrealistically-low-temperatures/100856)
**Author:** [@Ben\_S](https://www.simscale.com/forum/u/Ben_S)\ **Replies:** 2\ **Last updated:** [June 19, 2026, 1:33pm UTC](https://www.simscale.com/forum/t/cht-derived-heat-flux-on-inner-cylinder-wall-gives-unrealistically-low-temperatures/100856 "2026-06-19T13:33:36Z")
Hi everyone, I am simulating a high-pressure compressor cylinder (80 → 350 bar, bore 14 mm, stroke 50 mm) in a steady-state CHT setup in SimScale. Since I cannot model the actual compression cycle, I pre-calculated cycl… [Next page](https://www.simscale.com/forum/c/using-simscale/8.md?page=1)