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  1. AcuSolve uses a mix of shared and distributed memory parallel message passing. This hybrid MPI approach works very well for large compute systems and allows simulations to be scaled to thousands of compute cores. The suitability for a given simulation to scale to thousands of processors depends on a number of factors including the model size, the architecture of the compute platform, the network infrastructure, and the physics being solved for. However, there are some rough guidelines that can be used to determine an appropriate number of cores to use for a given simulation. For compute systems that utilize a high speed message passing network (i.e. Infiniband, Myrinet, etc.), AcuSolve is expected to scale nearly linearly down to approximately 10,000 finite element nodes per subdomain. In other words, AcuSolve should have nearly perfect parallel efficiency as long as there are at least 10,000 finite element nodes in each subdomain. If the number of processors is increased beyond this level, simulations will still run faster, but the parallel efficiency may not be ideal. To fully optimize the run time of your simulation on a given compute cluster, it is necessary to perform a scalability study to vary the number of processors and monitor the run time. However, the aformentioned guidelines can be used as a rough estimate. The AcuSolve log file contains a value called the "Interface node fraction". This value may also be of interest when determining how many processors is suitable for your parallel run. This value reports the fraction of nodes in the model that fall on subdomain boundaries. AcuSolve typically scales linearly when this value is less than ~.15.
  2. When trying to execute multiple acuRun jobs consecutively in a batch file, it is necessary to launch the processes using the "call" command. Without issuing the call command, the cmd interpreter exits the main batch file after the first instance of acuRun completes. This is because acuRun is also launched through a batch file, and Windows receives the exit signal upon its completion. The following commands represent an example of a batch file that will circumvent this issue by using the call command: cd D:\test\pipe1 call acuRun -pb pipe1 -np 2 cd D:\test\pipe2 call acuRun -pb pipe2 -np 2
  3. Hello I am fairly new to CFD having tried to use Code saturne for too long and given up I have now come to Hyperworks. Being a fairly basic user I would like a fairly basic tutorial to create a mesh and boundary conditions for a single geometry. The mesh will be a solid block with no moving parts subjected to a range of wind speeds. All the tutorials I have seen complicate the instructions with fancy twiddly bits like moving parts etc. and I am never sure of the basic instructions at the core. Hope someone can help Many thanks Peter
  4. Hi there, I am a student working on the pre processing part of CFD analysis of Francis type turbine. I have created the 3D geometry(assembly) in Solid Works(I have 4 main parts namely, the Volute, Guide vanes, Impeller and Diffuser). These are simplified geometries, meaning I have removed all holes or gaps and have a 3D solid model with 4 main parts. I wish to export this model to hypermesh, but need help on how to set up the model. I can individually load the model and mesh it, but I am facing difficulty if I load the complete assembly. Hence I want to know if I can mesh all the components separately and then assemble the meshed geometries in one hypermesh file. Also, since the impeller is rotating, how do I impose sliding mesh condition in this case?. I want to get started as soon as possible as there a no Tuitorials of such kind for CFD meshing in Hypermesh. Any information will be useful to get started off. Thanks
  5. Hi ! I'm trying to find the drag force of the air on a sphere. I'm using MLAW6 with the k-epsilon model on a tetramesh for the air, and M11 BOUND for the bound on a cubic mesh, the sphere is meshed with shells and put in a rigidbody. I chose an eulerian formulation (i also tried ALE..)ter I imposed a velocity of 10m/s on the first row of nodes of the air. I used the interface TYPE18 with a gap larger than 1.5times the element size to be sure it works. Master : sphere, slave : air But i still have the error : TIME STEP LESS OR EQUAL DTMIN FOR SOLID ELEMENTS This is strange because when the air is meshed using a cubic mesh it works quite well (even though i usually get a drag force about twice as large as what i calculated myself with the formula) Any ideas why it doesnt work ? and how i could make it work ? Thanks Matt
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