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Found 7 results

  1. Hello Everyone, I was wondering what constraint, shall i assign for simply support condition (Hypermesh/optistruct) to a beam for modal analysis? Thank you for taking your precious time to reply. - Pramod
  2. hai, I am doing a tutorial taken from the Altair site which is a bird strike on aircraft wing. while i am doing i had a doubt regarding the boundary condition application. i don't know how to apply boundary condition in radioss. please help
  3. Dani

    fatal error occured

    Hai all, I am doing a linear static analysis by optistruct, when i try to run there show an error "fixed boundary condition in spc is not supported for linear static analysis" what will be the reason for this error? Please help me to understand the error and its solution. best regards, Dani
  4. Rajendra Prasad

    ACUSOLVE

    I am facing problem with boudary layer. When I am not maintaining BLs result is converging easily but showing wrong result. Only55 to 60% accuracy I am getting. When I am maintaining BL, result is not converging. The values are fluctuating so much, Actually modal is EGR coolar and has two flow i.e. coolant & Exhaust gas. In first trail, I solved with no BL, I got 60% accuracy. I got result trendy at very low time step 60, and I solved it for ten days till TS 1000, but result was same. There is no change. In 2nd trail, I am solving with BL at wall seperating coolant & gas. But here, result I am not getting trendy atleast. 300 TS, already completed, still no result. Solver is also very slow. Taking too much time. For each TS it is taking nearlly 20mins. I have attached inp & log file please find it. Please do needful as I wasted nearlly 1 month on it. Regards Rajendra Prasad BorgWarner Emission System CorrugatedTube_T2.2.Log CorrugatedTube_T2.inp
  5. Hi, I have another post about this same topic but I wanted to create a new one in order to keep the problem concise and detailed as possible. My goal is that I want to be able to create a constant force load over a curved surface (specifically, the upper half of a semi-circle) and have every force load be normal to said surface while utilizing 2-D shell elements. Currently, this is how I am doing it. 1. The geometry (and mesh) is the upper half of a semi-circle with a radius of ~4cm (average element mesh size is 0.05cm). *I have been previously doing this model with only horizontal and vertical forces on the arced surface (never combined) E.g. Horizontal forces in the +y direction on the left third of the arc, vertical forces in the -z direction on the top third of the arc, and another set of horizontal forces in the -y direction on the right third of the arc. 2. My boss asked me to combine horizontal and vertical forces in such a way that I will have a (let's just use an easy number) constant 100N force applied to every node on the arc in a direction normal to the surface of said arc (this is hopefully supposed to simulate some sort of compression-like force load). 3. Selecting all of the nodes, I know there are 252 of them on the arc in total. E.g. This makes sense because the length of the arc is equal to s = pi*radius = 12.5664cm and Total # of Nodes = s/.05cm = 252 nodes (approximately) 4. Combining horizontal and vertical forces at each node just requires two simple equations and a little bit of Matlab code *thetaSEP = 180deg / 252 = 0.7143deg (approximately) and hypotenuse = 100N Iteration 1 (Node 1): cos(thetaSEP) = horizontal/hypotenuse = 100N -sin(thetaSEP) = vertical/hypotenuse = 0N Iteration 2 (Node 2): cos(thetaSEP) = horizontal/hypotenuse = 99.9922N -sin(thetaSEP) = vertical/hypotenuse = -1.2466N etc. etc. etc. *Horizontal equation changes to -cos AFTER the 126 iteration 5. After doing this (and hopefully my math is correct...), I have two vectors, H = [1 x 252] and V = [1 x 252] which have been transferred into Excel (I just like Excel a little better than Matlab) which represents the horizontal and vertical forces that I need to combine at each node to create my constant 100N force load along the arc. ***6. Here, I did my first model by hand entering all 252 force vectors, one at a time. ***This is where I'm hoping someone can give me help on how to automate the process from this point into applying these loads across the nodes I have selected in HyperMesh with correct values (which leads to angle as well). If anyone has any help or details (or more resources for that matter) that I can try to make this process faster, that would be much appreciated. User: Q.NGUYEN-DAI has already given me some great advice but to be completely honest, I've never used Tcl in my life nor have I really programmed that much. Even if someone has a more efficient idea of doing this, could you please explain where I'm making this harder than it needs to be (I understand the "one by one" by hand part is the serious problem)? Thanks ahead of time and sorry for the long post. Attached is an image describing the problem a bit more if you need some visual clues as to further explain my situation. Dylan Stelzer
  6. alpharays786

    adiabatic surface BC

    Hi, In acusolve, which one is the correct setting to present adiabatic condition for surface BC? a-> environment temp. = 25 degree C Temperature BC type = Value Temperature = 25 degree C or b-> environment temp. = 25 degree C Temperature BC type = Flux Heat flux = 0.0 Convective heat flux coefficient = 0.0 Convective heat flux reference temperature = 0.0 degree C c-> environment temp. = 25 degree C Temperature BC type = Flux Heat flux = 0.0 Convective heat flux coefficient = 0.0 Convective heat flux reference temperature = 25 degree C Thanks
  7. Jehu

    Surface BC

    Hello, i would like to load a pressure on the interface of my system. Is it possible to put a pressure on a surface, without that this surface is an inlet or outflow? Thx
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